EBK COLLEGE PHYSICS
3rd Edition
ISBN: 9780321989246
Author: Knight
Publisher: PEARSON CO
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Chapter 28, Problem 6CQ
To determine
To explain: Flow of current without any complete circuit in photo electric effect experiment.
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Figure Q28.5 shows the typical photoelectric behavior of a metal as the anode-cathode potential difference ΔV is varied.
a. Why do the curves become horizontal for ΔV ? 1V? Shouldn’t the current increase as the potential difference increases? Explain.
b. Why doesn’t the current immediately drop to zero for ΔV < 0 V? Shouldn’t ΔV < 0 V prevent the electrons from reaching the anode? Explain.
c. The current is zero for ΔV < -2.0 V . Where do the electrons go? Are no electrons emitted if ΔV < -2.0 V? Or if they are, why is there no current? Explain.
A gold cathode (work function = 5.1 eV) is illuminated with light of wavelength 250 nm. It is
found that the photoelectron current is zero when AV = 0 V. Would the current change if:
a. The intensity is doubled?
b. The anode-cathode potential difference is increased to AV= 5.5 V?
c. The cathode is changed to aluminum (work function = 4.3 eV)?
A particular metal is illuminated by UV photons of wavelength 210 nm, and electrons up to 1.25 eV are emitted from the surface. What is the maximum KE of photoelectrons emitted when the UV photons are, instead, 175 nm in wavelength?A. 1.18 eVB. 2.44 eVC. 5.90 eVD. 7.09 eV
Chapter 28 Solutions
EBK COLLEGE PHYSICS
Ch. 28 - Prob. 1CQCh. 28 - Prob. 2CQCh. 28 - Prob. 3CQCh. 28 - Prob. 4CQCh. 28 - Prob. 5CQCh. 28 - Prob. 6CQCh. 28 - Prob. 7CQCh. 28 - Prob. 8CQCh. 28 - Prob. 9CQCh. 28 - Prob. 10CQ
Ch. 28 - Prob. 11CQCh. 28 - Prob. 12CQCh. 28 - Prob. 13CQCh. 28 - Prob. 14CQCh. 28 - Prob. 15CQCh. 28 - Prob. 16CQCh. 28 - Prob. 17CQCh. 28 - Prob. 18CQCh. 28 - Prob. 19CQCh. 28 - Prob. 20CQCh. 28 - Prob. 21CQCh. 28 - Prob. 22CQCh. 28 - Prob. 23CQCh. 28 - Prob. 24CQCh. 28 - Prob. 25CQCh. 28 - Prob. 26MCQCh. 28 - Prob. 27MCQCh. 28 - Prob. 28MCQCh. 28 - Prob. 29MCQCh. 28 - Prob. 30MCQCh. 28 - Prob. 31MCQCh. 28 - Prob. 32MCQCh. 28 - Prob. 33MCQCh. 28 - Prob. 34MCQCh. 28 - Prob. 35MCQCh. 28 - Prob. 1PCh. 28 - Prob. 2PCh. 28 - Prob. 3PCh. 28 - Prob. 4PCh. 28 - Prob. 5PCh. 28 - Prob. 6PCh. 28 - Prob. 7PCh. 28 - Prob. 8PCh. 28 - Prob. 9PCh. 28 - Prob. 10PCh. 28 - Prob. 11PCh. 28 - Prob. 12PCh. 28 - Prob. 13PCh. 28 - Prob. 14PCh. 28 - Prob. 15PCh. 28 - Prob. 16PCh. 28 - Prob. 17PCh. 28 - Prob. 18PCh. 28 - Prob. 19PCh. 28 - Prob. 20PCh. 28 - Prob. 21PCh. 28 - Prob. 22PCh. 28 - Prob. 23PCh. 28 - Prob. 24PCh. 28 - Prob. 25PCh. 28 - Prob. 26PCh. 28 - Prob. 27PCh. 28 - Prob. 28PCh. 28 - Prob. 29PCh. 28 - Prob. 30PCh. 28 - Prob. 31PCh. 28 - Prob. 32PCh. 28 - Prob. 33PCh. 28 - Prob. 34PCh. 28 - Prob. 35PCh. 28 - Prob. 36PCh. 28 - Prob. 37PCh. 28 - Prob. 38PCh. 28 - Prob. 39PCh. 28 - Prob. 40PCh. 28 - Prob. 41PCh. 28 - Prob. 42PCh. 28 - Prob. 43PCh. 28 - Prob. 44PCh. 28 - Prob. 45PCh. 28 - Prob. 46PCh. 28 - Prob. 47PCh. 28 - Prob. 48PCh. 28 - Prob. 49PCh. 28 - Prob. 50GPCh. 28 - Prob. 51GPCh. 28 - Prob. 52GPCh. 28 - Prob. 53GPCh. 28 - Prob. 54GPCh. 28 - Prob. 55GPCh. 28 - Prob. 56GPCh. 28 - Prob. 57GPCh. 28 - Prob. 58GPCh. 28 - Prob. 59GPCh. 28 - Prob. 60GPCh. 28 - Prob. 61GPCh. 28 - Prob. 62GPCh. 28 - Prob. 63GPCh. 28 - Prob. 64GPCh. 28 - Prob. 65GPCh. 28 - Prob. 66GPCh. 28 - Prob. 67GPCh. 28 - Prob. 68GPCh. 28 - Prob. 69GPCh. 28 - Prob. 70GPCh. 28 - Prob. 71GPCh. 28 - Prob. 72GPCh. 28 - Prob. 73GPCh. 28 - Prob. 74GPCh. 28 - Prob. 75GPCh. 28 - Prob. 76GPCh. 28 - Prob. 77GPCh. 28 - Prob. 78GPCh. 28 - Prob. 79GPCh. 28 - Prob. 80GPCh. 28 - Prob. 81GPCh. 28 - Prob. 82GPCh. 28 - Prob. 83GPCh. 28 - Prob. 84GPCh. 28 - Prob. 85MSPPCh. 28 - Prob. 86MSPPCh. 28 - Prob. 87MSPPCh. 28 - Prob. 88MSPP
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- A 400-nm laser beam is projected onto a calcium electrode. The power of the laser beam is 2.00 mW and the work function of calcium is 2.31 eV. (a) How many photoelectrons per second are ejected? (b) What net power is carried away by photoelectrons?arrow_forwardA 600-nm light falls on a photoelectric surface and electrons with the maximum kinetic energy of 0.17 eV are emitted. Determine (a) the work function and (b) the cutoff frequency of the surface. (c) What is the stopping potential when the surface is illuminated with light of wavelength 400 nm?arrow_forwardA 900-W microwave generator in an oven generates energy quanta of frequency 2560 MHz. (a) How many energy quanta does it emit per second? (b) How many energy quanta must be absorbed by a pasta dish placed in the radiation cavity to increase its temperature by 45.0 K? Assume that the dish has a mass of 0.5 kg and that its specific heat is 0.9 kcal/kg • K. (c) Assume that all energy quanta emitted by the generator are absorbed by the pasta dish. How long must we wait until the dish in (b) is ready?arrow_forward
- (a) Calculate the momentum of a photon having a wavelength of 2.50 m. (b) Find the velocity of an electron having the same momentum. (c) What is the kinetic energy of the electron, and how does it compare with that of the photon?arrow_forward(a) What is the momentum of a 0.0100-nm-wavelength photon that could detect details of an atom? (b) What is its energy in MeV?arrow_forwardA certain photoelectric devise is sensitive to wavelengths up to 940 nm. a. What is the frequency associated with this wavelength? b. What is the work function for the cathode if the threshold wavelength is 890 nm? c. What is the frequency of 690 nm light? d. If light with a wavelength of 690 nm strikes the photocathode, what is the maximum kinetic energy of the emitted electrons?arrow_forward
- 5. A metal surface has a photoelectric cutoff wavelengthof 325.6 nm. It is illuminated with light of wavelength259.8 nm. What is the stopping potential? 6. A surface of zinc is illuminated and photoelectrons areobserved. (a) What is the largest wavelength that will causephotoelectrons to be emitted? (b) What is the stoppingpotential when light of wavelength 220.0 nm is used? 7. X-ray photons of wavelength 0.02480 nm are incident on atarget and the Compton-scattered photons are observed at90.0◦(a) What is the wavelength of the scattered photons?(b) What is the momentum of the incident photons? Of thescattered photons? (c) What is the kinetic energy of thescattered electrons? (d) What is the momentum (magnitudeand direction) of the scattered electrons? 8.What is the minimum X-ray wavelength produced inbremsstrahlung by electrons that have been acceleratedthrough 2.50 × 104 V?arrow_forwardThe intensity of sunlight that can be captured and detected by a visible light detector which has a wavelength of 700 nm on the earth's surface is 1500 W/m^2 a. the energy per photon of visible light that can be detected is ... joulesb. the number of photons of light detected by the device per second if the device has a surface area of 3 m^2 .... photonsarrow_forwardPotassium and gold cathodes are used in a photoelectriceffect experiment. For each cathode, find:a. The threshold frequency b. The threshold wavelengthc. The maximum electron ejection speed if the light has awavelength of 220 nmd. The stopping potential if the wavelength is 220 nmarrow_forward
- A photoelectric experiment has a work function = 6.35 eV. The minimum cutoff frequency is 1.53E15 Hz a.) Purple light (wavelength 420 nm)- the energy of the photon is ______ eV What is the kinetic energy? b.) Ultraviolet (wavelength 130 nm)- the energy of the UV photon is _______eV. What is the kinetic energy?arrow_forwardWhat is the wavelength in nm of a photon that has a momentum of 4.5*10^-27 kg.m/sarrow_forwardA particular metal is illuminated by UV photons of wavelength 210 nm, and electrons up to 1.25 eV are emitted from the surface. What is the maximum KE of photoelectrons emitted when the UV photons are, instead, 175 nm in wavelength? A. 1.18 eV В. 2.44 eV С. 5.90 eV D. 7.09 eVarrow_forward
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