Fundamentals of Physics, Volume 1, Chapter 1-20
10th Edition
ISBN: 9781118233764
Author: David Halliday
Publisher: WILEY
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Chapter 38, Problem 85P
To determine
To calculate
a) the Planck’s constant from the given data.
b) the work function for lithium from the given data
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Students have asked these similar questions
85 In about 1916, R. A. Millikan found the following stopping-
potential data for lithium in his photoelectric experiments:
Wavelength (nm) 433.9 404.7
Stopping
potential (V)
365.0 312.5
253.5
0.55
0.73
1.09
1.67
2.57
Use these data to make a plot like Fig. 38-2 (which is for sodium)
and then use the plot to find (a) the Planck constant and (b) the
work function for lithium.
In a particular photoelectric experiment, a stopping potential of 2.1 V is measured when
ultraviolet light with a wavelength of 290 nm is incident on a metal. Given the light of speed
c = 3.0 x 108 m/s and Planck constant h = 6.625 x 10-34 J. s or 4.14 × 10-15 eV.s
%3D
(a) Describe and illustrate the photoelectric experiment and explain why it cannot be
explained by classical physics.
(b) Using the same setup and metal, determine the stopping potential if blue light with a
wavelength of 440 nm is used, instead of the ultraviolet light.
(c) Using the same setup and metal, describe what happened if a red light with a wavelength
of 620 nm is used, instead of the ultraviolet light.
Light of wavelength 350 nm falls on a potas-
sium surface, and the photoelectrons have a
maximum kinetic energy of 1.3 eV.
What is the work function of potassium?
The speed of light is 3 × 10° m/s and Planck's
J.s.
-34
constant is 6.63 × 10°
Answer in units of eV.
What is the threshold frequency for potas-
sium?
Answer in units of Hz.
Chapter 38 Solutions
Fundamentals of Physics, Volume 1, Chapter 1-20
Ch. 38 - Prob. 1QCh. 38 - Prob. 2QCh. 38 - Prob. 3QCh. 38 - Prob. 4QCh. 38 - Prob. 5QCh. 38 - Prob. 6QCh. 38 - Prob. 7QCh. 38 - Prob. 8QCh. 38 - Prob. 9QCh. 38 - Prob. 10Q
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