Modern Physics for Scientists and Engineers
Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Chapter 4, Problem 47P
To determine

Calculate the value of Planck’s constant determined by Franck and Hertz.

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Calculate the value of Planck’s constant determined by Franck and Hertz when they observed the 254-nm ultraviolet radiation using Hg vapor.
Calculate the de Broglie wavelength of proton, if it is moving with speed of 2 × 105 m/s. Mass of proton (m) = 1.67 x 10-27 kg. Planck's × constant = 6.625 × 10-34 Js.
In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 × 10-15 V s. Calculate the value of Planck’s constant.
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