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Rutherford's Observations

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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, $E = 2.4 e V$
Work function $ϕ = 1.6 e V$
We kow that, $e V_{0} = E - ϕ \Rightarrow e V_{0} = (2.4 - 1.6) e V \Rightarrow V_{0} = 0.8 V$
Hence, the correct choice is (a).

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