COLLEGE PHYSICS,V.2
COLLEGE PHYSICS,V.2
11th Edition
ISBN: 9781305965522
Author: SERWAY
Publisher: CENGAGE L
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Chapter 27, Problem 12P

(a)

To determine

Which of the metal emit photoelectrons in response to the light and why.

(b)

To determine

The maximum kinetic energy for the photoelectrons.

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.  Lithium, beryllium, and mercury have work functions of 2.30 eV, 3.90 eV, and 4.50 eV, respectively. Light with a wavelength of 400 nm is incident on each of these metals. (a) Which of these metals emit photoelectrons in response to the light? Why? (b) Find the maximum kinetic energy (en eVs)for the photoelectrons in each case where photoelectrons are emitted.
When ultraviolet light with a wavelength of 254 nm falls on a clean copper surface, the stopping potential necessary to stop emission of photoelectrons is 0.181 V. (a) What is the photoelectric threshold wavelength for this copper surface? (b) What is the work function for this surface, and how does your calculated value compare with that given in Table
When ultraviolet light with a wavelength of 264 nmnm falls upon a clean metal surface, the stopping potential necessary to terminate the emission of photoelectrons is 0.178 VV . A) What is the photoelectric threshold wavelength for this metal? Express your answer in nanometers.   B) What is the work function for the metal? Express your answer in electronvolts.
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