University Physics with Modern Physics (14th Edition)
University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 38, Problem 38.8E
To determine

The minimum work function for a metal to eject photoelectrons in visible light.

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When ultraviolet light with a wavelength of 420 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.1 eV. (a) What is the stopping potential for these photoelectrons with this Kmax? (b) What is the threshold frequency for this metal? (c) What is the maximum kinetic energy of photoelectrons when light of wavelength 314 nm falls on the same surface?
The work function for indium is 4.12 eV. (d) If light of energy 7.14 eV is incident on indium, what is the maximum kinetic energy of the ejected photoelectrons? Give the answer in electron volts. eV (e) For photons of energy 7.14 eV, what stopping potential would be required to arrest the current of photoelectron? V
A metal surface is illuminated with light of different wavelengths and the corresponding stopping potentials of the photoelectrons are shown in the Table below. λ (Å) 1869 2372 2875 V(V) 1.37 1.27 1.17 Using the Table, determine the photoelectric threshold wavelength (in Å).

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University Physics with Modern Physics (14th Edition)

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