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Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli
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If the threshold wavelength in the photoelectric effect

Chapter 8, Problem 5Q

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QUESTION:

Problem 5Q

If the threshold wavelength in the photoelectric effect increases when the emitting metal is changed to a different metal, what can you say about the work functions of the two metals?

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QUESTION:

Problem 5Q

If the threshold wavelength in the photoelectric effect increases when the emitting metal is changed to a different metal, what can you say about the work functions of the two metals?

ANSWER:

Solution 5Q: We have to correlate the work function of two different metal in terms of their threshold wavelength. Step 1 of 2 Concept: Kinetic energy(KE) of an emitted electron when a light of wavelength ()falls on a metal whose threshold wavelength is ( ) is given as, o 1 1 KE = hc ( o) …(a) Work function of the metal is defined as the minimum amount of energy just enough to remove the electron from its atom. Mathematically, hc W = o …(b)

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