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Chapter: 27 -Problem: 80 >> Clever farmers with power lines crossing their land have been known to steal power by stringing wire near the power line and making use of the induced current. At least one such crime went to court and resulted in a conviction?despite the defense?s claim that the defendant didn?t touch the lines. Figure 27.42 shows a possible crime scene, with a rectangular wire loop mounted in a vertical plane be
Answer Preview: C remain the same The induced emf in a wire loop due to an exte…

, Chapter: 33 -Problem: 1 >> Why was the Michelson Morley experiment a more sensitive test of motion through the ether than independent measurements of the speed of light in two perpendicular directions?
Answer Preview: The interferometric method used in the …

, Chapter: 30 -Problem: 27 >> White light propagating in air is incident at 45? on the equilateral prism of Fig. 30.19. Find the angular dispersion g of the outgoing beam if the prism has refractive indices nred = 1.582 and nviolet = 1.633. Transcribed Image Text: 45° Red Violet FIGURE 30.19 Exercise 27 (angles of dispersed ray
Answer Preview: The angular dispersion is 6 47 Explanation of Solution Given Info The angle of prism is 60 the refra…

, Chapter: 30 -Problem: 36 >> You?ve dropped your car keys at night off the end of a dock into water 1.6m deep. A flashlight held directly above the dock edge and 0.50 m above the water illuminates the keys when it?s aimed at 40? to the vertical, as shown in Fig. 30.21. What?s the horizontal distance x from the edge of the dock to the keys? Transcribe
Answer Preview: The depth of the water is d 1 6 m The height of the flash light is h 0 5 m The angle of inc…

, Chapter: 36 -Problem: 60 >> Repeat Problem 58 for the case of an infinite square well containing N particles, rather than for a harmonic oscillator. Express your answer in terms of the ground-state energy E1.Data from Problem 58An infinite square well containing a number of particles is in its lowest possible energy state, which is 19 times the ground-state energy E1 for the same well when it contains a single particle. (a)
Answer Preview: a The number of particles in the well is N 19 b The energy of the highest energy particle …

, Chapter: 34 -Problem: 44 >> Electrons in a photoelectric experiment emerge from an aluminum surface with maximum kinetic energy 1.3 eV. Find the wavelength of the illuminating radiation.
Answer Preview: The energy of photoelectrons is related to the energy of th…

, Chapter: 33 -Problem: 32 >> The nearest star beyond our solar system is about 4 light years away. If a spaceship can get to the star in 5 years, as measured on Earth, (a) how long would the ship’s pilot judge the journey to take? (b) How far from Earth would the pilot find the star to be?
Answer Preview: A The formula for time dilation is Calculate the speed of spaceship relative to Earth as follows …

, Chapter: 28 -Problem: 29 >> Find the impedance at 10 kHz of a circuit consisting of a 1.5k? resistor, 5.0?F capacitor, and 50-mH inductor in series.
Answer Preview: Impedance z for se…

, Chapter: 20 -Problem: 24 >> Find the magnitude of the electric force on a 2.0 µC charge in a 100-N/C electric field.
Answer Preview: The electric field intensity is defined as forc…

, Chapter: 31 -Problem: 73 >> Show that identical objects placed equal distances on either side of the focal point of a concave mirror or converging lens produce images of equal size. Are the images of the same type?
Answer Preview: Write the expression for Lens equations 1s 1s 1f Here s is the object distance s is the image distan…

, Chapter: 36 -Problem: 22 >> Verify the value of the Bohr magneton ?B in Equation 36.14 Transcribed Image Text: eh M. = ±; 2m (36.14)
Answer Preview: Bohr Magnetron l min s 4m…

, Chapter: 37 -Problem: 31 >> Find an expression for the energy of a photon required for a transition from the (l - 1)th level to the lth level in a molecule with rotational inertia I.
Answer Preview: The energy transition will be equal to 1 551019J So you know y…

, Chapter: 33 -Problem: 67 >> When an object’s speed increases by 5%, its momentum increases by a factor of 5. What was its original speed?
Answer Preview: Let Initial speed s units and Let Initial momentum m units …

, Chapter: 33 -Problem: 13 >> An airplane makes a round trip between two points 1800 km apart, flying with airspeed 800 km/h. What’s the round trip flying time (a) if there’s no wind, (b) with wind at 130 km/h perpendicular to a line joining the two points,   (c) with wind at 130km/h along a line joining the two points?
Answer Preview: Answer a Given Info The separation between two points is 1800km and airspeed is 800km hr Write the f…

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, Chapter: 24 -Problem: 9 >> The resistance of a metal increases with increasing temperature, while the resistance of a semiconductor decreases. Why the difference?
Answer Preview: The resistivity of a metal is determined by collisions which increase with in…

, Chapter: 29 -Problem: 73 >> Proposals have been made to ?sail? spacecraft to the outer solar system using the pressure of sunlight, or even to propel interstellar spacecraft with high-powered, Earth-based lasers. Sailing spacecraft would need no fuel a great advantage because fuel constitutes much of the initial weight of any space mission. NASA?s Sunjammer, launched in 2015, is the first sailing spacecraft deployed beyond E
Answer Preview: A the sail force will still exceed solar gravity now by a factor of 4 Ex plan …

, Chapter: 32 -Problem: 74 >> Even the nearest stars are so distant that a single diffraction limited telescope capable of imaging Earth-size planets orbiting them would be hopelessly large (see Problem 45). Astronomers get around this limitation using interferometry to combine data from several telescopes, producing an instrument that acts like a single telescope with aperture equal to the distance between the individual tele
Answer Preview: Based on the information provided in Problem 45 it is not feasible to con…

, Chapter: 36 -Problem: 75 >> Using the table below, make a plot of atomic volume versus atomic number, for the elements from Z = 30 to Z = 59 listed in the table. Comment on the structure of your graph in relation to the periodic table, the electronic structures of atoms, and their chemical properties. (Volumes are in units of 10-30 m3 .) Transcribed
Answer Preview: based on the data given in the table the graph of atomic volume versus atomic number for elements from Z 30 to Z 59 would display a generally decreasi…

, Chapter: 39 -Problem: 55 >> Many particles are far too short-lived for their lifetimes to be measured directly. Instead, tables of particle properties often list “width,” measured in energy units and indicating the width of the distribution of measured rest energies. For example, the Z0 has mass 91.18 GeV and width 2.5 GeV. Use the energy–time uncertainty relation to estimate its corresponding lifetime. D
Answer Preview: The uncertainty principle states that the product of the uncertaint…

, Chapter: 32 -Problem: 50 >> The table below lists the angular positions of the bright fringes that result when monochromatic laser light shines through a diffraction grating, as a function of order m. The spacing between lines of the grating is d = 3.2?m. Determine a quantity that, when plotted against m, should give a straight line. Plot the data, determine a best-fit line, and use the result to find the wavelength of the l
Answer Preview: To determine a quantity that when plotted against m should give a straight line we can use the relat…

, Chapter: 28 -Problem: 41 >> At 15 kHz an inductor has 12 times the reactance of a capacitor. At what frequency will their reactances be equal?
Answer Preview: Given Inductive reactance 12 capacities reactance at 15 KHz We know that …

, Chapter: 32 -Problem: 2 >> Why does an oil slick show colored bands?
Answer Preview: Because of interfe…

, Chapter: 31 -Problem: 80 >> The table below shows measurements of magnification versus object distance for a lens. Determine a quantity that, when you plot object distance against it, should give a straight line. Make your plot, establish a best-fit line, and use your line to find the focal length of the lens. Transcribed Image Text:
Answer Preview: The graph is plotted and the focal length of the lens is 42 8cm Explanation of Solution Given Info s …

, Chapter: 30 -Problem: 28 >> Suppose the 60? angle in Fig. 30.18 is changed to 75?. A ray enters the mirror system parallel to the axis.(a) How many reflections does it make?(b) Through what angle is it turned when it exits the system? Transcribed Image Text: Exercise 12 - 60°- Exercise 14 FIGURE 30.18 Exercises 12 and 14 and
Answer Preview: a Angle between mirror is 75 0 and light enters the mirror parallel …

, Chapter: 37 -Problem: 19 >> Photons of wavelength 1.68 cm excite transitions from the rotational ground state to the first rotational excited state in a gas. What’s the rotational inertia of the gas molecules?
Answer Preview: For transition between rotational ground state to rotational f…

, Chapter: 34 -Problem: 72 >> Use the series expansion for ex (Appendix A) to show that Planck’s law (Equation 34.3) reduces to the Rayleigh–Jeans law (Equation 34.5) when l >> hc/kT. Transcribed Image Text: 2rhc? R(A, T) (34.3) (ehc/AKT - 1) 2nckT R(A, T) (34.5)
Answer Preview: According to Planck s law R T 2hc 2 5 e hckT 1 34 3 by using series expansion for e x we g…

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, Chapter: 25 -Problem: 41 >> A 6.0-V battery has internal resistance 2.5 ?. If the battery is short-circuited, what’s the rate of energy dissipation in its internal resistance?
Answer Preview: A dE P V dt 6V Rate of …

, Chapter: 37 -Problem: 7 >> Radio astronomers have discovered many complex organic molecules in interstellar space. Why were these discoveries made with radio telescopes and not optical telescopes?
Answer Preview: These discoveries were made wit…

, Chapter: 30 -Problem: 53 >> You’re an optometrist, mounting a projector at the back of your 4.2-m-long exam room, 2.6 m above the floor. It shines an eyetest pattern on a white wall opposite the projector. Patients will sit with their eyes 3.3 m from the wall and 1.4m above the floor to view the pattern. At what height should you center the pattern on the wall?
Answer Preview: If you are going to center the projection then you want to draw …

, Chapter: 34 -Problem: 77 >> Consider an elastic collision between a photon with initial wavelength ?0 moving in the x-direction and a stationary electron, as depicted in Fig. 34.9b. Use relativistic expressions for energy and momentum from Chapter 33 to show that conservation of energy and momentum yield the equations hc/?0 + mc2 = hc/? + ?mc2 , h/ ?0 = (h/ ?) cos? + ?mu cos?, and 0 = (h/ ?) sin? - ?mu sin?, where ? is the p
Answer Preview: The conservation of energy and momentum in this elastic collision between a photon and an electron c…

, Chapter: 36 -Problem: 58 >> A harmonic oscillator potential with natural frequency ? contains N electrons and is in its state of lowest energy. Find expressions for the total energy for (a) N even  (b) N odd.
Answer Preview: The infinite potential energy outside the box means that there is zero probability of …

, Chapter: 34 -Problem: 41 >> The radiance of a blackbody peaks at 558 nm. (a) What’s its temperature? (b) How does its radiance at 382 nm (violet light) compare with that at 694 nm (red light)?
Answer Preview: For this question We have a black body with the peak wavelength Lambda P of 558 Nano meters A um and …

, Chapter: 32 -Problem: 35 >> A double-slit experiment has slit spacing 0.035 mm, slit-to screen distance 1.5m, and wavelength 490 nm. What’s the phase difference between two waves arriving at a point 0.56 cm from the center line of the screen?
Answer Preview: Given info The slit to screed spacing is 1 5m The slit spacing is 0 035mm The wavele…

, Chapter: 25 -Problem: 38 >> Three 1.5-V batteries, with internal resistances 0.01 ?, 0.1 ?, and 1 ?, each have 1? resistors connected across their terminals. What’s the voltage between each battery’s terminals, to three significant figures?
Answer Preview: Battery 1 1 5 AB is the terminal of batteries so VAB Voltage divider to Let vo…

, Chapter: 35 -Problem: 3 >> Bohr’s correspondence principle states that quantum and classical mechanics must agree in a certain limit. Give an example.
Answer Preview: A particle in a square well provides a good example For …

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, Chapter: 34 -Problem: 80 >> Perform a numerical integration of Equation 34.3 to the wavelength given by Equation 34.2b. Divide by the result of Problem 79, and thus verify that Equation 34.2b gives the wavelength above and below which a blackbody radiates half its energy. Transcribed Image Text: Amedian T = 4.11 mm K (34.2b)
Answer Preview: To perform the numerical integration of Equation 34 3 we need to integrate it over the wavelength range given by Equation 34 2b which is median 4 11 m…

, Chapter: 36 -Problem: 69 >> A selection rule for the infinite square well allows only those transitions in which n changes by an odd number. Suppose an infinite square well of width 0.200 nm contains an electron in the n = 4 state. (a) Draw an energy-level diagram showing all allowed transitions that could occur as this electron drops toward the ground state, including transitions from lower levels that could be reached from
Answer Preview: a The energy levels of an electron in an infinite square well are given by the equation En h 2 8mL 2 …

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, Chapter: 33 -Problem: 22 >> At what speed will the momentum of a proton (mass 1 u) equal that of an alpha particle (mass 4 u) moving at 0.5c?
Answer Preview: Explanation Write the formula to calculate the momentum of the proton pp mpup1 …

, Chapter: 24 -Problem: 74 >> A brownout occurs when an electric utility can’t supply enough power to meet demand. Rather than cut off some customers completely, the utility reduces the voltage across its system. Brownouts are most likely on hot summer days, when heavy air-conditioning loads drive up demand for electricity. In a particular brownout, the utility reduces the voltage by 10%.During the brownout, the power dissipat
Answer Preview: The power dissipated in conductors whose resistance is nearly indep…

, Chapter: 32 -Problem: 8 >> When the Moon passes in front of a star, the starlight intensity fluctuates before going to zero instead of dropping abruptly. Explain.
Answer Preview: The stars light is diffracted aro…

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, Chapter: 35 -Problem: 32 >> Find an expression for the normalization constant A for the wave function given by ? = 0 for |x| > b and ? = A (b2-x2) for -b ?x ?b
Answer Preview: Atomic volume can be defined as the total space acquired by one mole of an element in i…

, Chapter: 37 -Problem: 41 >> What wavelength of infrared radiation is needed to excite a transition between the n = 0, l = 3 states and the n = 1, l = 2 states in KCl, for which the rotational inertia is 2.43x10-45 kgm2 and the classical vibration frequency is 8.40 THz?
Answer Preview: To find the wavelength of infrared radiation needed to excite a transition between the n 0 l 3 state…

, Chapter: 34 -Problem: 67 >> Find the minimum electron speed that would make an electron microscope superior to an optical microscope using 450-nm light.
Answer Preview: The minimum speed for ele…

, Chapter: 32 -Problem: 23 >> Monochromatic light shines on a glass wedge with refractive index 1.65, and enhanced reflection occurs where the wedge is 450 nm thick. Find all possible values for the wavelength in the visible range.
Answer Preview: Answer Given info The refractive index of the glass is 1 65 The thickness where enha…

, Chapter: 23 -Problem: 68 >> (a) Write the electrostatic potential energy of a pair of oppositely charged, closely spaced parallel plates as a function of their separation x, their area A, and the charge magnitude Q. (b) Differentiate with respect to x to find the magnitude of the attractive force between the plates. Why isn’t the force equal to the charge on one plate times the electric field between the plates?
Answer Preview: Answer a To determine The electro static potential energy of the capacitor The electrostati…

, Chapter: 20 -Problem: 23 >> An electron experiences an electric force of 0.61 nN. What’s the field strength at its location?
Answer Preview: The relation between the electric force F experienced b…

, Chapter: 31 -Problem: 48 >> How far apart are the object and image produced by a converging lens with 35-cm focal length when the object is (a) 40 cm (b) 30 cm from the lens
Answer Preview: Write the expression for Lens equations 1s 1s 1f Here s is the object distance s is the image distan…

, Chapter: 32 -Problem: 71 >> Even the nearest stars are so distant that a single diffraction limited telescope capable of imaging Earth-size planets orbiting them would be hopelessly large (see Problem 45). Astronomers get around this limitation using interferometry to combine data from several telescopes, producing an instrument that acts like a single telescope with aperture equal to the distance between the individual tele
Answer Preview: The answer is c halve Doubling the separation of two telescopes comprising …

, Chapter: 36 -Problem: 62 >> A hydrogen atom is in an F state. (a) Find the possible values for its total angular momentum. (b) For the state with the greatest angular momentum, find the number of possible values for the component of J(vector) on a given axis.
Answer Preview: Speed is a scalar and velocity is a vector Speed gets t…

, Chapter: 33 -Problem: 76 >> You’ve been named captain of NASA’s first interstellar mission since the Voyager robotic spacecraft. You board your spaceship, accelerate quickly to 0.8c, and cruise at constant speed toward Proxima Centauri, the closest star to our Sun. Proxima Centauri is 4 light-years distant as measured in the two stars’ common rest frame. On the way, you conduct various medical experiments to determine the ef
Answer Preview: It s the same as when you re on Earth According to relativity …

, Chapter: 32 -Problem: 32 >> What’s the longest wavelength of light you could use to resolve a structure with angular diameter 0.44 mrad, using a microscope with a 1.2-mm-diameter objective lens?
Answer Preview: Q min 1 22 D Q min D 1 2…

, Chapter: 25 -Problem: 21 >> What resistance should you place in parallel with a 56k? resistor to make an equivalent resistance of 45 k??
Answer Preview: Solution we know the equivalent resistance R eq of two resistances …

, Chapter: 33 -Problem: 6 >> If you’re in a spaceship moving at 0.95c relative to Earth, do you perceive time to be passing more slowly than it would on Earth? Think! Is your answer consistent with the relativity principle?
Answer Preview: No everything seems perfectly nor…

, Chapter: 31 -Problem: 38 >> Repeat Problem 37 for a convex mirror, assuming all numbers stay the same.Data from Problem 37A 12-mm-high object is 10 cm from a concave mirror with focal length 17 cm. (a) Where is the image, (b) how high is it,   (c) what type is it?
Answer Preview: a where is the image …

, Chapter: 36 -Problem: 26 >> An infinite square well contains nine electrons. Find the energy of the highest-energy electron in terms of the ground-state energy E1.
Answer Preview: Given that the number of electrons in infinite squ…

, Chapter: 36 -Problem: 65 >> Form the radial probability density P2(r) associated with the ?2s state of Equation 36.7, and find the electron’s most probable radial position. Transcribed Image Text: 1 -r/2ao (36.7) 25 2 ao 4V2ma
Answer Preview: The Schrdinger equation has two forms one in which time exp…

, Chapter: 34 -Problem: 59 >> Find (a) the wavelength (b) the energy in electronvolts of the photon emitted when a Rydberg hydrogen atom drops from the n = 180 level to the n = 179 level.
Answer Preview: Initial energy state n 180 Final energy state n 179 Formula HI…

, Chapter: 33 -Problem: 21 >> By what factor does an object’s momentum change if you double its speed when its original speed is (a) 25m/s and (b) 100Mm/s?
Answer Preview: Momentum P mv M mass kg V Velocity m …

, Chapter: 23 -Problem: 48 >> You’re evaluating a new hire in your company’s engineering department. Together you’re working on a circuit where a 0.1?F, 50-V capacitor is in series with a 0.2?F, 200-V capacitor. The new engineer claims you can safely put 250 V across the combination. What do you say?
Answer Preview: You can safely put 250V across the combination Kirchhoffs Voltage Law can be app…

, Chapter: 32 -Problem: 6 >> In deriving the intensity in double-slit interference, why can’t you simply add the intensities from the two slits?
Answer Preview: Intensities …

, Chapter: 29 -Problem: 68 >> Your friend who works for the college radio station must make electric-field measurements for a report to be filed with the station’s application for license renewal. The measurement is made 4.6km from the antenna, where your friend measures the electric field at 380V/m. The station is allowed to broadcast at no more than 55-kW power. Assuming power spreads equally in all directions, is the statio
Answer Preview: No the station is not in compliance with its license The maximu…

, Chapter: 35 -Problem: 38 >> The ground-state energy for an electron in infinite square well A is equal to the energy of the first excited state for an electron in well B. How do the wells’ widths compare?
Answer Preview: A typical radiative process in which an electron jumps fr…

, Chapter: 37 -Problem: 54 >> Pure aluminum, which superconducts below 1.20 K, exhibits a critical field of 9.57 mT. Find the maximum current that can be carried in a 30-gauge (0.255-mm-diameter) aluminum superconducting wire without the field from that current exceeding the critical field.
Answer Preview: The maximum current I that can be carried in a 30 gauge aluminum superconducting wire can …

, Chapter: 34 -Problem: 26 >> Which spectral line of the hydrogen Paschen series (n2 = 3) has wavelength 1282 nm?
Answer Preview: given 1282nm and n1 3 …

, Chapter: 32 -Problem: 46 >> In the second-order spectrum from a diffraction grating, yellow light at 588 nm overlaps violet light (wavelength range 390 nm– 450 nm) diffracted in a different order. What’s the exact wavelength of the violet light, and what’s the order of its diffraction?
Answer Preview: Calculations Now we know that formula for diffracting grating is dsin m dsin 2 588nm 1176 n…

, Chapter: 23 -Problem: 55 >> A sphere of radius R carries total charge Q distributed uniformly over its surface. Show that the energy stored in its electric field is U = kQ2 /2R.
Answer Preview: Einside 0 Eoutside U The Electrostatic …

, Chapter: 20 -Problem: 15 >> Protons and neutrons are made from combinations of the two most common quarks, the u quark (charge +2/3e) and the d quark (charge -1/3e). How could three of these quarks combine to make (a) a proton (b) a neutron
Answer Preview: All the Hadrons are made by quarks There are 6 types of qu…

, Chapter: 31 -Problem: 18 >> A virtual image is located 40 cm behind a concave mirror with focal length 18 cm. (a) Where is the object? (b) By how much is the image magnified?
Answer Preview: In concave mirror virtual image is formed when object is placed between focus and opti…

, Chapter: 35 -Problem: 57 >> The table below lists the wavelengths emitted as electrons in identical square-well potentials drop from various states n to the ground state. Determine a quantity that, when you plot l against it, should yield a straight line. Make your plot, establish a best-fit line, and use your line to determine the width of the square well.
Answer Preview: A quantity that when plotted against wavelength should yield a straight line is the re…

, Chapter: 36 -Problem: 67 >> (a) Verify Equation 36.8 by considering a single-electron atom with nuclear charge Ze instead of e.(b) Calculate the ionization energies for single-electron versions of helium, oxygen, lead, and uranium.? Transcribed Image Text: Z²E, n? (13.6 eV)Z² n? (36.8) En n2 2ma
Answer Preview: a Equation 36 8 is the formula for the ionization energy of an electron in an atom given b…

, Chapter: 33 -Problem: 57 >> A large city consumes electrical energy at the rate of 1GW. If you converted all the rest mass in a 1-g raisin to electrical energy, for how long could it power the city?
Answer Preview: we begin by noting that one gigawatt distended the nine jewels for second and one gram is …

, Chapter: 31 -Problem: 82 >> The speed of a camera lens measures its ability to photograph in dim light. Speed is characterized by f-ratio, also called the f-number, defined as the ratio of focal length f to lens diameter d. Thus an f/2.8 lens, for example, has diameter d = f/2.8. The actual amount of light a lens admits depends on its area A, but the inverse-square law shows that the light intensity at the camera?s imaging s
Answer Preview: Increasing the f ratio from 2 8 to 5 6 b decreases the light admitted by a factor …

, Chapter: 24 -Problem: 71 >> You work for an automobile manufacturer developing a new plug-in hybrid car. The car’s mass is 1200 kg, and it uses a 360-V battery driving an electric motor that can handle a maximum current of 180 A. You’re to specify the greatest slope the car can climb, maintaining 60 km/h, without its gasoline engine coming on to assist.
Answer Preview: This question …

, Chapter: 34 -Problem: 4 >> What colors of visible light have the highest-energy photons?
Answer Preview: Blu…

, Chapter: 35 -Problem: 40 >> Sketch the probability density for the n = 2 state of an infinite square well extending from x = 0 to x = L, and determine where the particle is most likely to be found.
Answer Preview: The alkali metals have high atomic sizes Alkali metal…

, Chapter: 36 -Problem: 30 >> Write the full electronic structure of bromine.
Answer Preview: Atomic number z 35 bromine has 7 valence electrons the 4s orbital …

, Chapter: 34 -Problem: 51 >> A 150-pm X-ray photon Compton-scatters off an electron and emerges at 135° to its original direction. Find (a) the wavelength of the scattered photon (b) the electron’s kinetic energy.
Answer Preview: a The wavelength of the sc…

, Chapter: 31 -Problem: 65 >> A camera can normally focus as close as 60 cm, but it has provisions for mounting additional lenses just in front of the main lens to provide close-up capability. What type and power of auxiliary lens will allow the camera to focus as close as 20 cm?
Answer Preview: Camera lens Focal distance F c 60 cms Overall focal le…

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, Chapter: 35 -Problem: 10 >> What fundamental principle of physics, when combined with quantum mechanics, provides a theoretical basis for the existence of antimatter?
Answer Preview: The p…

, Chapter: 29 -Problem: 51 >> A typical fluorescent lamp is a little more than 1 m long and a few cm in diameter. How do you expect the light intensity to vary with distance (a) near the lamp but not near either end and (b) far from the lamp?
Answer Preview: a The intensity will be higher near the lamp The reason is that …

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, Chapter: 34 -Problem: 69 >> An electron is trapped in a “quantum well” 23 nm wide. Find its minimum possible speed.
Answer Preview: We re told that we have an electron in a quantum well here So because it s a quantum well you might be thinking we re gonna be using some quantum mech…

, Chapter: 31 -Problem: 60 >> An object is 28 cm from a double-convex lens with n = 1.5 and curvature radii 35 cm and 55 cm. Where is the image, and what type is it?
Answer Preview: Ans Given that n 1 5 u 28cm R1 35 cm R2 55cm V Use the Lens makers formul…

, Chapter: 24 -Problem: 46 >> How must the diameters of copper and aluminum wire be related if they’re to have the same resistance per unit length?
Answer Preview: Since copper is better conductor than aluminium that means the resistivity of co…

, Chapter: 33 -Problem: 8 >> Is matter converted to energy in a nuclear reactor? In a burning candle? In your body?
Answer Preview: Yes to all its just that nuclear react…

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, Chapter: 35 -Problem: 47 >> A particle detector has a resolution 15% of the width of an infinite square well. What’s the probability that the detector will find a particle in the ground state of the square well if the detector is centered on (a) the midpoint of the well (b) a point one fourth of the way across the well?
Answer Preview: The infinite potential energy outside the box means that there …

, Chapter: 36 -Problem: 74 >> You work for a company that makes red helium?neon lasers widely used in physics experiments. Figure 36.19 shows an energy-level diagram for this laser. An electric current excites helium to a metastable level E1 at 20.61 eV above the ground state. Collisions transfer energy to neon atoms, exciting them to E2 = 20.66 eV. The lasing transition drops the atoms to E3, emitting a 632.8-nm photon in the
Answer Preview: The maximum possible efficiency for this laser is 100 This is because all of the energy supplied …

, Chapter: 34 -Problem: 74 >> Show that the frequency range of the hydrogen spectral line series involving transitions ending at the nth level is ?f = cRH/(n + 1)2 .
Answer Preview: Let n be the energy level of the hydrogen atom and c be the speed of …

, Chapter: 32 -Problem: 62 >> Under the best conditions, atmospheric turbulence limits ground-based telescopes’ resolution to about 1 arcsecond (1/3600 of a degree). For what apertures is this limitation more severe than that of diffraction at 550 nm? (Your answer shows why large ground-based telescopes don’t generally produce better images than small ones, although they do gather more light.)
Answer Preview: Given info The resolution of ground bases telescope u…

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, Chapter: 25 -Problem: 32 >> If capacitance is in ?F, what will be the units of the time constant RC when resistance is in (a) ?, (b) k?, (c) M??
Answer Preview: Q C V V IR Q C IR where I Q …

, Chapter: 35 -Problem: 4 >> The ground-state wave function for a quantum harmonic oscillator has a single central peak. Why is this at odds with classical physics?
Answer Preview: Because as the preceding que…

, Chapter: 31 -Problem: 29 >> A tiny insect is trapped 1.0 mm from the center of a spherical dewdrop 4.0mm in diameter. As you look straight into the drop, what’s the insect’s apparent distance from the drop’s surface?
Answer Preview: Refraction at curved surfaces e…

, Chapter: 30 -Problem: 14 >> If a light ray enters the mirror system of Fig. 30.18 propagating in the plane of the page and parallel to one mirror, through what angle will it be turned? ? Transcribed Image Text: Exercise 12 60 Exercise 14 FIGURE 30.18 Exercises 12 and 14 and Problem 28
Answer Preview: In this question angle between mirror is 60 0 and the light …

, Chapter: 36 -Problem: 56 >> A harmonic oscillator potential with natural frequency v contains a number of electrons and is in its state of lowest energy. If that energy is 6.5?? (a) how many electrons are in the potential well   (b) what’s the energy of the highest-energy electron?
Answer Preview: a The number of electrons in the potential well depends on the number of energy states of the harmo…

, Chapter: 34 -Problem: 33 >> A proton is confined to a space 1 fm wide (about the size of an atomic nucleus). What’s the minimum uncertainty in its velocity?
Answer Preview: Uncertainty in position x if m 1 1 0 15 m mass of proton m …

, Chapter: 32 -Problem: 18 >> Green light at 520nm is diffracted by a grating with 3000lines/cm. Through what angle is the light diffracted in (a) first (b) fifth order?
Answer Preview: On diffraction grating light incident norma…

, Chapter: 29 -Problem: 29 >> What would be the average intensity of a laser beam so strong that its electric field produced dielectric breakdown of air (which requires Ep = 3 MV/m)?
Answer Preview: The relation between intensity and magn…

, Chapter: 24 -Problem: 17 >> The electric field in an aluminum wire is 85 mV/m. Find the current density in the wire.
Answer Preview: We know Where I current V Potential difference R Resist…

, Chapter: 36 -Problem: 3 >> How many quantum numbers are required to specify fully the state of a hydrogen atom?
Answer Preview: Four…

, Chapter: 29 -Problem: 71 >> Proposals have been made to ?sail? spacecraft to the outer solar system using the pressure of sunlight, or even to propel interstellar spacecraft with high-powered, Earth-based lasers. Sailing spacecraft would need no fuel a great advantage because fuel constitutes much of the initial weight of any space mission. NASA?s Sunjammer, launched in 2015, is the first sailing spacecraft deployed beyond E
Answer Preview: b a little less than 0 5 m s2 Step by step explantion The acceleration …

, Chapter: 30 -Problem: 33 >> You look at the center of one face of a solid glass cube of glass, on a line of sight making a 55° angle with the normal to the cube face. What minimum refractive index of the glass will let you see through the cube’s opposite face?
Answer Preview: s time considered an interval or ratio variable The short answer Time is consider…

, Chapter: 36 -Problem: 36 >> Find (a) the energy (b) the magnitude of the orbital angular momentum for an electron in the 5d state of hydrogen.
Answer Preview: a Here n 5 Energy 13 6 n 13 6 …

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, Chapter: 32 -Problem: 69 >> You’re on an international panel charged with allocating “real estate” for communications satellites in geostationary orbit. The panel needs to know how many satellites could fit in geostationary orbit without receivers on the ground picking up multiple signals. Assume all satellites broadcast at 12 GHz and that receiver dishes are 45 cm in diameter. Begin by calculating the angular size of the be
Answer Preview: The angular size of the beam associated with a 45…

, Chapter: 28 -Problem: 42 >> A 0.75-H inductor is in series with a fluorescent lamp, and the combination is across 120-V rms, 60-Hz power. If the rms inductor voltage is 90V, what’s the rms lamp current?
Answer Preview: Inductor of inductance 0 75 H r m s Voltag…

, Chapter: 36 -Problem: 4 >> Both the Bohr and Schrödinger theories predict the same groundstate energy for hydrogen. Do they agree about the angular momentum in the ground state? Explain.
Answer Preview: They disagree about the angular momentum In the …

, Chapter: 30 -Problem: 17 >> Light is incident on an air–glass interface, and the refracted light in the glass makes a 40° angle with the normal to the interface. The glass has refractive index 1.52. Find the incidence angle.
Answer Preview: Formula to be used Snell s law 1 sin 1 2 sin 2 where 1 is the refractive index of f…

, Chapter: 36 -Problem: 17 >> Which of the following is not a possible value for the magnitude of the orbital angular momentum in hydrogen: (a) ?12?; (b) ?20?; (c) ?30?; (d) ?40?; (e) ?56??
Answer Preview: Orbital angular momentum is given by the formula L root l l 1 where …

, Chapter: 34 -Problem: 55 >> An electron is known to be somewhere inside a carbon nanotube that’s 370 nm long and 1.2 nm in diameter. Find the minimum uncertainties in the components of its velocity (a) along the tube (b) perpendicular to the tube’s long dimension.
Answer Preview: a we take x length 2 and y diameter of the tube to find t…

, Chapter: 32 -Problem: 59 >> A camera has an f/1.4 lens, meaning the ratio of focal length to lens diameter is 1.4. Find the smallest spot diameter (i.e., the diameter of the first diffraction minimum) to which this lens can focus parallel light with 580-nm wavelength.
Answer Preview: Diameter of the aperture D f N Mini…

, Chapter: 28 -Problem: 64 >> Two capacitors are connected in parallel across a 24-V rms, 7.5-kHz sine-wave generator, and the generator supplies a total rms current of 56mA. With capacitors rewired in series, the rms current drops to 2.8mA. What are the two capacitances?
Answer Preview: Miniaturization of energy storage devices with enhanced performance metrics can reduce the footprint …

, Chapter: 38 -Problem: 11 >> Is 238U fissionable? Is it fissile? Explain the distinction.
Answer Preview: U 238 is fissionable meaning it can be m…

, Chapter: 31 -Problem: 44 >> An object 15 cm from a concave mirror has a virtual image magnified 2.5 times. What’s the mirror’s focal length?
Answer Preview: Solution Given object distance u 15 cm Magnification M …

, Chapter: 35 -Problem: 63 >> Quantum dots, or qdots, are nanoscale crystals of semiconductor material that trap electrons in a potential well closely resembling the three-dimensional square well discussed in Section 35.4. Physicists, materials scientists, and semiconductor engineers have been studying qdots for their potential to miniaturize electronic components. More recently, qdots have been used in biology and medicine to
Answer Preview: a nond eg ener ate Ex plan ation A perfect…

, Chapter: 34 -Problem: 66 >> Through what potential difference should you accelerate an electron from rest so its de Broglie wavelength will be the size of a hydrogen atom, about 0.1 nm?
Answer Preview: Theres a handy energy unit called the electron volt An electron accelerated by a poten…

, Chapter: 32 -Problem: 45 >> NASA asks you to assess the feasibility of a single-mirror spacebased optical telescope that could resolve an Earth-size planet 5 light-years away. What do you conclude?
Answer Preview: Telescopes were used to see the very far objects like stars …

, Chapter: 28 -Problem: 24 >> Find the resonant frequency of an LC circuit consisting of a 0.22?F capacitor and a 1.7-mH inductor.
Answer Preview: Figure The above fig shows the circuit diagram of LC circuit The Inductor L and t…

, Chapter: 36 -Problem: 2 >> A friend who hasn’t studied physics asks you the size of a hydrogen atom. How do you answer?
Answer Preview: The size of a hydrogen atom is a vague …

, Chapter: 31 -Problem: 77 >> The maximum magnification of a simple magnifier occurs with the image at the 25-cm near point. Show that the angular magnification is m = 1 + (25 cm/f), where f is the focal length.
Answer Preview: taking f 2…

, Chapter: 35 -Problem: 51 >> The generalization of the Schrödinger equation to three dimensions isFor a particle confined to the cubical region 0 ? x ? L, 0 ? y ? L, 0 ? z ? L, show by direct substitution that the equation is satisfied by wave functions of the form ? (x, y, z) = A sin(nx?x/L) sin(ny?y/L) sin(nz?z/L), where the n’s are integers and A is a constant. (b) In the process of working part (a), verify that the energi
Answer Preview: The wave function for a particle confined to the cubical region 0 x L 0 y L 0 z L is gi…

, Chapter: 34 -Problem: 68 >> You’re a cell biologist who wants to image microtubules that form the “skeletons” of living cells. The microtubules are 25 nm in diameter, and, as Chapter 32 shows, you need to image with waves whose wavelength is at least this small. You can use either an inexpensive electron microscope that accelerates electrons to kinetic energies of 40 keV, or a more expensive unit that produces 100-keV electr
Answer Preview: Yes the less expensive microscope will work The wavele…

, Chapter: 33 -Problem: 15 >> Two stars are 50 ly apart, measured in their common rest frame. How far apart are they to a spaceship moving between them at 0.75c?
Answer Preview: With respect to the …

, Chapter: 28 -Problem: 55 >> A series RLC circuit has resistance 127 ? and impedance 344 ?. (a) What’s the power factor? (b) If the rms current is 225 mA, what’s the power dissipation?
Answer Preview: 1 Generally Power factor is calculated as ratio of re…

, Chapter: 20 -Problem: 14 >> A typical lightning flash delivers about 25 C of negative charge from cloud to ground. How many electrons are involved?
Answer Preview: The charge Q is always quantized and follows the equation Q n …

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, Chapter: 33 -Problem: 40 >> Repeat Problem 39, now assuming that civilization B lags A by 1.2 million years in the galaxy’s reference frame.Data From Problem 39You’re writing a galactic history involving two civilizations that evolve on opposite sides of a 1.0x105 -ly-diameter galaxy. In the galaxy’s reference frame, civilization B launched its first spacecraft 45,000 years after civilization A. You and your readers, from a
Answer Preview: In the galaxy s reference frame civilization B launched its first spacecraft 45 000 years after civi…

, Chapter: 33 -Problem: 18 >> An extraterrestrial spacecraft whizzes through the solar system at 0.80c. How long does it take to go the 8.3 light-minute-distance from Earth to Sun (a) according to an observer on Earth (b) according to an alien aboard the ship?
Answer Preview: a From an observer on earth you would do a Newtonian physics approach Or 10 min…

, Chapter: 28 -Problem: 51 >> An RLC circuit includes a 1.5-H inductor and a 250?F capacitor rated at 400 V. The circuit is connected across a sine-wave generator with Vp = 32 V. What minimum resistance will ensure that the capacitor voltage does not exceed its rated value when the circuit is at resonance?
Answer Preview: Given info The inductance is 1 5H the capacitance is 250F the rated voltage of the capacitor is 400V …

, Chapter: 36 -Problem: 11 >> Helium and lithium exhibit very different chemical behavior, yet they differ by only one unit of nuclear charge. Explain.
Answer Preview: Heliums outermost shell the n 1 shell is full with two elec…

, Chapter: 31 -Problem: 19 >> (a) Where on the axis of a concave mirror would you place an object to get a half-size image? (b) Where will the image be located? (c) Will the image be real or virtual?
Answer Preview: Ans Using the formula of magnification m f u f Here f is f…

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, Chapter: 34 -Problem: 32 >> Find the de Broglie wavelength of electrons with kinetic energies (a) 10 eV, (b) 1.0 keV,   (c) 10 keV.
Answer Preview: So i Similarly ii i…

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, Chapter: 28 -Problem: 72 >> Your professor tells you about the days before digital computers when engineers used electric circuits to model mechanical systems. Suppose a 5.0-kg mass is connected to a spring with k = 1.44 kN/m. This is then modeled by an LC circuit with L = 2.5 H. What should C be in order for the LC circuit to have the same resonant frequency as the mass–spring system?
Answer Preview: The capacitance for the LC circuit to have the same resonant frequency as the mass spring sys…

, Chapter: 38 -Problem: 3 >> Why might future archaeologists have problems dating samples from the second half of the 20th century?
Answer Preview: Radioactive fallout from …

, Chapter: 29 -Problem: 66 >> Your roommate’s father is CEO of a coal company, so your roommate is understandably skeptical of alternative energy proposals. He claims that there’s no future for solar energy, because the power in sunlight is insufficient to meet humankind’s energy demand. Is he right? To find out, compare the solar power incident on Earth with our human energy consumption rate of about 16 TW.
Answer Preview: solar power incident is about 2 5 TW as shown we have about 31 million seconds in a year a…

, Chapter: 35 -Problem: 29 >> If all sides of a cubical box are doubled, what happens to the ground-state energy of a particle in that box?
Answer Preview: The temperature off such a substance decreases becau…

, Chapter: 33 -Problem: 52 >> Compare the momentum changes needed to boost a spacecraft (a) from 0.10c to 0.20c (b) from 0.80c to 0.90c.
Answer Preview: a Given Info The change in speed of spacecraft is from 0 10c to 0 20c Write the formula to calculate …

, Chapter: 32 -Problem: 16 >> In a three-slit system, the first minimum occurs at angular position 5°. Where is the next maximum?
Answer Preview: The first thing to note is that each of the slits produces a diffraction pattern the width of which is controlled by the width of the slit and the wavelength of the light The amount of light travellin…

, Chapter: 29 -Problem: 32 >> A laser pointer delivers 0.10-mW average power in a beam 0.90mm in diameter. Find (a) the average intensity, (b) the peak electric field,   (c) the peak magnetic field.
Answer Preview: Given that Power p 0 10 mW 1 x 10 4 W Diameter d 0 90 mm 9 x 10 4 m Then the radius r 2 4 5 x …

, Chapter: 32 -Problem: 7 >> The primary maxima in multiple-slit interference are in the same angular positions as those in double-slit interference. Why, then, do diffraction gratings have thousands of slits instead of just two?
Answer Preview: Use of many slits makes th…

, Chapter: 29 -Problem: 59 >> A radar system produces pulses consisting of exactly 100 full cycles of a sinusoidal 72.5-GHz electromagnetic wave. The average power while the transmitter is on is 66.0 MW, and the waves are confined to a beam 22.4 cm in diameter. Find (a) the peak electric field, (b) the wavelength, (c) the total energy in one pulse, and (d) the total momentum in one pulse. (e) If the transmitter produces 945 pu
Answer Preview: a The peak electric field is given by E peak sqrt 2 P avg pi c A sqrt 2 66 0 MW pi 3 00e…

, Chapter: 35 -Problem: 22 >> A 3-g snail crawls at 0.5 mm/s between two rocks 15 cm apart. Treating this system as an infinite square well, determine the approximate quantum number. Does the correspondence principle permit the use of the classical approximation in this case?
Answer Preview: m 3 10 3 kg v l 15 cm 15 10 2 cm E 0 5m…

, Chapter: 34 -Problem: 70 >> Typically, an atom remains in an excited state for about 10-8 s before it drops to a lower state, emitting a photon in the process. What’s the uncertainty in the energy of this transition?
Answer Preview: This is a two variable problem Since the energy of the photon …

, Chapter: 32 -Problem: 17 >> A five-slit system with 7.5?m slit spacing is illuminated with 633-nm light. Find the angular positions of (a) the first two maxima (b) the third and sixth minima.
Answer Preview: The angular position of first maxima is 4 8 The angular position of the second maxima is 9 7 Explana…

, Chapter: 28 -Problem: 38 >> A 2.0?F capacitor has 1.0k? reactance. (a) What’s the frequency of the applied voltage? (b) What inductance would give the same reactance at this frequency? (c) How would the reactances compare if the frequency were doubled?
Answer Preview: Give C 2F Xc 1k a To find frequency f X c 1 C We know that angular frequency 2f X c 1 2fC …

, Chapter: 34 -Problem: 5 >> Why is the immediate ejection of electrons in the photoelectric effect surprising from a classical viewpoint?
Answer Preview: Because wave energy is spread …

, Chapter: 31 -Problem: 42 >> At what two distances could you place an object from a 45-cm-focal-length concave mirror to get an image 1.5 times the object’s size?
Answer Preview: Given focal length f 45cm Magnification m 1 5 m v u v 1 5u app…

, Chapter: 35 -Problem: 46 >> In your physical chemistry course, you model hydrogen chloride as a hydrogen atom on a spring; the other end of the spring is attached to a rigid wall (the massive chlorine atom). In order to determine the spring constant in your model, you measure the minimum photon energy that will promote HCl molecules to their first excited state. The result is 0.358 eV. What do you calculate for the effective
Answer Preview: The effective k can be calculated using the equation k hc 2 …

, Chapter: 33 -Problem: 39 >> You’re writing a galactic history involving two civilizations that evolve on opposite sides of a 1.0x105 -ly-diameter galaxy. In the galaxy’s reference frame, civilization B launched its first spacecraft 45,000 years after civilization A. You and your readers, from a more advanced civilization, are traveling through the galaxy at 0.99c on a line from A to B. Which civilization do you record as hav
Answer Preview: Kindl…

, Chapter: 33 -Problem: 24 >> A particle is moving at 0.90c. If its speed increases by 10%, by what factor does its momentum increase?
Answer Preview: Given Data Initial speed s1 0 9c units 299792458 9 m s 2698132…

, Chapter: 24 -Problem: 18 >> What electric field is necessary to drive a 7.5-A current through a 0.95-mm-diameter silver wire?
Answer Preview: Given I 7 5A dia 0 95mm radius r 0 475mm As we know J E where J is the current density is …

, Chapter: 37 -Problem: 3 >> The electrostatic attraction between oppositely charged ions is what binds atoms in an ionic molecule. Is the electric force involved in covalent bonding? Explain.
Answer Preview: In a covalent bond electrons tend to spend …

, Chapter: 31 -Problem: 39 >> An object’s image in a 27-cm-focal-length concave mirror is upright and magnified by a factor of 3. Where is the object?
Answer Preview: Given f 27 cm Image is upright and mag…

, Chapter: 35 -Problem: 25 >> Find the ground-state energy for a particle in a harmonic oscillator potential whose classical angular frequency ? is 1.0x1017 s-1.
Answer Preview: Since the classical angular frequen…

, Chapter: 34 -Problem: 62 >> A hydrogen atom is in its ground state when its electron absorbs a 48-eV photon. What’s the energy of the resulting free electron?
Answer Preview: the energy of the un…

, Chapter: 33 -Problem: 20 >> A hospital’s linear accelerator produces electron beams for cancer treatment. The accelerator is 1.6 m long and the electrons reach a speed of 0.98c. How long is the accelerator in the electrons’ reference frame?
Answer Preview: Answer Given Info The proper length of the accelerator is 1 6m and the speed of electrons is 0 98c …

, Chapter: 23 -Problem: 63 >> A solid sphere contains a uniform volume charge density. What fraction of the total electrostatic energy of this configuration is contained within the sphere?
Answer Preview: ELECTROSTATIC ENERGY of TOTAL ELECTROST…

, Chapter: 20 -Problem: 13 >> Suppose the electron and proton charges differed by one part in one billion. Estimate the net charge on your body, assuming it contains equal numbers of electrons and protons.
Answer Preview: solution Mass of an atom is concentrated in its Nucleus Nucleu…

, Chapter: 30 -Problem: 16 >> Information in a compact disc is stored in “pits” whose depth is essentially one-fourth the wavelength of the laser light used to “read” the information. That wavelength is 780 nm in air, but the wavelength on which the pit depth is based is measured in the n = 1.55 plastic that makes up most of the disc. Find the pit depth
Answer Preview: Given Info The refractive index of the plastic is 1 55 and …

, Chapter: 34 -Problem: 76 >> Show that Wien’s law (Equation 34.2a) follows from Planck’s law (Equation 34.3). (Differentiate Planck’s law with respect to wavelength.) Transcribed Image Text: ApeakT= 2.898 mm. K (Wien's law) (34.2a)
Answer Preview: In the planks spectrum of black body radiation predicts the Wien displacement law and may be used to …

, Chapter: 34 -Problem: 37 >> Find the minimum energy for a neutron in a uranium nucleus whose diameter is 15fm.
Answer Preview: x p 2 p 2x K E 2 2m 2x 1 …

, Chapter: 31 -Problem: 69 >> You stand with your nose 6.0 cm from the surface of a reflecting ball, and your nose’s image appears three-quarters full size. What’s the ball’s diameter?
Answer Preview: The diameter of the ball is 72cm Explanation of Solution Given Info The distance between nose an…

, Chapter: 24 -Problem: 62 >> A 240-V electric motor is 90% efficient, meaning that 90% of the energy supplied to it ends up as mechanical work. If the motor lifts a 200-N weight at 3.1 m/s, how much current does it draw?
Answer Preview: Efficiency E Given Efficiency 90 Outp…

, Chapter: 34 -Problem: 6 >> Suppose the Compton effect were significant at radio wavelengths. What problems might this present for radio and TV broadcasting?
Answer Preview: Radio and TV signals would chang…

, Chapter: 31 -Problem: 49 >> A candle and a screen are 70 cm apart. Find two points between candle and screen where you could put a convex lens with 17-cm focal length to give a sharp image of the candle on the screen.
Answer Preview: Given Info The focal length of the convex lens is 17cm the distance betwe…

, Chapter: 30 -Problem: 29 >> The refractive index of a human cornea is 1.40. If 550-nm light strikes a cornea at incidence angle 25°, find (a) the angle of refraction   (b) the wavelength in the cornea.
Answer Preview: a Snell s equation n1 …

, Chapter: 34 -Problem: 53 >> A photocathode ejects electrons with maximum energy 0.85 eV when illuminated with 430-nm blue light. Will it eject electrons when illuminated with 633-nm red light? If so, what will be the maximum electron energy?
Answer Preview: so working function w hc 85 1 …

, Chapter: 32 -Problem: 22 >> Light of unknown wavelength shines on a precisely machined glass wedge with refractive index 1.52. The closest point to the apex of the wedge where reflection is enhanced occurs where the wedge is 98 nm thick. Find the wavelength.
Answer Preview: If the distance from the apex to this point is 98 nanometers we get a wavelength of 13 …

, Chapter: 24 -Problem: 34 >> You touch a defective appliance while standing on the ground, and you feel the tingle of a 2.5-mA current. What’s your resistance, assuming you’re touching the “hot” side of the 120-V household wiring?
Answer Preview: given data current of defectives …

, Chapter: 34 -Problem: 8 >> How many spectral lines are in the entire Balmer series?
Answer Preview: Infinitely many be…

, Chapter: 30 -Problem: 47 >> In cataract surgery, ophthalmologists replace the eye’s natural lens with a synthetic intraocular lens, or IOL. A particular IOL has refractive index 1.452. Find the angle of refraction for a light ray striking this lens with incidence angle 77.0°. The medium before the IOL is the eye’s aqueous humor, a liquid with n = 1.337.
Answer Preview: The angle of refraction for a light ray striking the lens is 63 8 E…

, Chapter: 34 -Problem: 78 >> What would the constant in Equation 34.2a be if blackbody radiance were defined for fixed intervals of frequency rather than wavelength? (Use ? = c/f to express the radiance as R(f, T), then differentiate to find the maximum, and solve the resulting relation numerically. Express your answer in a form like Equations 34.2a and b.)
Answer Preview: If blackbody radiance were defined for fixed intervals of frequency rather than wavelength the cons…

, Chapter: 34 -Problem: 64 >> Ultraviolet light with wavelength 75 nm shines on hydrogen atoms in their ground states, ionizing some of the atoms. What’s the energy of the electrons freed in this process?
Answer Preview: Energy h 2c Total energ…

, Chapter: 31 -Problem: 81 >> The speed of a camera lens measures its ability to photograph in dim light. Speed is characterized by f-ratio, also called the f-number, defined as the ratio of focal length f to lens diameter d. Thus an f/2.8 lens, for example, has diameter d = f/2.8. The actual amount of light a lens admits depends on its area A, but the inverse-square law shows that the light intensity at the camera?s imaging s
Answer Preview: Zooming your camera s lens for telephoto shots increases the …

, Chapter: 20 -Problem: 45 >> In Fig. 20.29, take q1?=25 ?C and q2 =20 ?C.If the force on q1 points in the -x-direction, find(a) q3?(b) the magnitude of the force on q1 Transcribed Image Text: ? (m) 2- 92 ? (m) 3 2 FIGURE 20.29
Answer Preview: q1 25 C and q2 20 C force on charge q1 due to q2 is given by …

, Chapter: 25 -Problem: 14 >> Sketch a diagram for a circuit consisting of two batteries, a resistor, and a capacitor, all in series. Does the circuit description allow you any flexibility?
Answer Preview: Resistor …

, Chapter: 36 -Problem: 13 >> What distinguishes a Bose–Einstein condensate from ordinary matter?
Answer Preview: All the particles in a …

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, Chapter: 36 -Problem: 16 >> Find the maximum possible magnitude for the orbital angular momentum of an electron in the n = 7 state of hydrogen.
Answer Preview: The Orbital angular momentum of an electron revolving in an orbit with principal quantum …

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