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Question

Light of wavelength λ falls on a metal having work function hcλ0. Photoelectric effect will take place only if


A

λλ0

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B

λ2λ0

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C

λλ0

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D

λ<λ02

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Solution

The correct option is C

λλ0


So photo electric effect will only be shown if the energy of each photon is more than the work function.

Wavelength of light used is λ

So energy of each photon ishcλ
Now this should be greater than work function

hcλhcλ0

λλ0


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