Explanation Write the expression for the work function. W 0 = h c λ − e V 0 Here, W 0 is the work function, h is the Planck’s constant, c is the speed of light , V 0 is the stopping potential, and λ is the wave length. Conclusion: Substitute 230 nm for λ max , 1.84 V for V 0 , 6.63 × 10 − 34 J ⋅ s for h , and 3.00 × 10 8 m / s for c in above equation to find W 0 . W 0 = ( 6.63 × 10 − 34 J ⋅ s ) ( 3

Physics for Science and Engineering With Modern Physics, VI - Student Study Guide

4th Edition

ISBN: 9780132273244

Author: Doug Giancoli

Publisher: PEARSON

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Chapter 37, Problem 21P

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The work function of the metal.

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Chapter 37, Problem 20P

Chapter 37, Problem 22P

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(4) (i) Light shining on a metal surface produces photoelectrons with a maximum kinetic energy of 2.0 eV. The light intensity is then doubled. Now what is the maximum kinetic energy of the photoelectrons, in eV? (ii) The detector in an ordinary digital camera is made of silicon. This detector works by the photoelectric effect. The longest wavelength of light that an ordinary digital camera can detect has a wavelength of 1 micron (where 1 micron = 10^-6 m). What is the work function of silicon, in eV? (iii) Infrared cameras don't use detectors made of silicon. For an infrared camera to detect infrared radiation with a wavelength of 22 microns, its detector must be made of a dierent material. What is the maximum possible work function of this material, in eV?

(i) Define the term ‘threshold frequency’ as used in photoelectric effect. (ii) Plot a graph showing the variation of photoelectric current as a function of anode potential for two light beams having the same frequency but different intensities I1 and I2 (I1 > I2 ).

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Chapter 37 Solutions

Physics for Science and Engineering With Modern Physics, VI - Student Study Guide

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The work function of the metal.

Solution Summary: The author explains the work function of the metal, which is 3.56eV.

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