Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Chapter 37, Problem 6Q
To determine
Validity of cut-off frequency in wave theory and particle theory.
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During an experiment 8.7×10¹4 Hz light shines on a metal plate and the Photoelectric Effect occurs. It is determined that the stopping potential is 2.3 V. Determine the momentum
(in N's) a photon has at the given frequency & determine the cutoff frequency (fo).
p=
fo=
The figure shows an apparatus for observing the photoelectric effect. In this apparatus, a light
source illuminates a metallic emitter plate (E). Photoelectrons are emitted and accelerate toward
the collector ring (C). The presence of emitted electrons can be detected by measuring the current
flowing in the circuit.
Suppose the light source is of a single wavelength (A = 140 nm). Suppose also that the binding
energy of electrons in the metal emitter () = 3.8 eV. What is the maximum kinetic energy of
emitted electrons?
Kmax =
For this metal emitter, what is the maximum wavelength for which electrons will be emitted?
1₂ =
What will happen if the intensity of the light is decreased (keeping the same wavelength)?
00000
nm
ev
O The electron current will decrease but not go to zero (and Kmax will be unchanged)
The electron current will decrease and Kmax will also decrease
the maximum kinetic energy of individual electrons will decrease (no other changes)
The electron current may go to zero
O…
Chapter 37 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 37.2 - Prob. 1AECh. 37.2 - Prob. 1BECh. 37.4 - Prob. 1CECh. 37.7 - Prob. 1DECh. 37.7 - Prob. 1EECh. 37.11 - Prob. 1FECh. 37 - Prob. 1QCh. 37 - Prob. 2QCh. 37 - Prob. 3QCh. 37 - Prob. 4Q
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- The work function of a photoelectric surface is 2.00 eV. What is the maximum speed of the photoelectrons emitted from this surface when a 450-nm light falls on it?arrow_forwardIn the interpretation of the photoelectric effect, how is it known that an electron does not absorb more than one photon?arrow_forwardExplain how you can determine the work function from a plot of the stopping potential versus the frequency of the incident radiation in a photoelectric effect experiment. Can you determine the value of Planck’s constant from this plot?arrow_forward
- What is the maximum kinetic energy of photoelectrons ejected from sodium by the incident radiation of wavelength 450 nm?arrow_forwardIf the work function of a metal is 3.2 eV, what is the maximum wavelength that a photon can have to eject a photoelectron from this metal surface?arrow_forwardEstimate the binding energy of electrons in magnesium, given that the wavelength of 337 nm is the longest wavelength that a photon may have to eject a photoelectron from magnesium photoelectrode.arrow_forward
- Estimate the work function of aluminum, given that the wavelength of 304 nm is the longest wavelength that a photon may have to eject a photoelectron from aluminum photoelectrode.arrow_forwardWhich aspects of the photoelectric effect cannot be explained by classical physics?arrow_forwardSuppose that in the photoelectric-effect experiment we make a plot of the detected current versus the applied potential difference. What information do we obtain from such a plot? Can we determine from it the value of Planck’s constant? Can we determine the work function of the metal?arrow_forward
- What is the longest wavelength of radiation that can eject a photoelectron from silver? Is it in the visible range?arrow_forwardFind the maximum velocity of photoelectrons ejected by an 80-nm radiation, if the work function of photoelectrode is 4.73 eV.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_forward
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