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Question

What is the stopping potential for photoelectrons ejected from a photosensitive material of work function 1.6 eV when it is irradiated by photons of energy 2.4 eV?

A
0.8 V
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B
2.0 V
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C
4.0 V
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D
None of these
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Solution

The correct option is A 0.8 V
Energy of photon, E=2.4 eV
Work function ϕ=1.6 eV
We kow that, eV0=EϕeV0=(2.41.6) eVV0=0.8 V
Hence, the correct choice is (a).

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