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A photon of energy 4 eV is incident on a...

A photon of energy `4 eV` is incident on a metal surface whose work function is `2 eV`. The minimum reverse potential to be applied for stopping the emission of electrons is

A

2 V

B

4 V

C

6 V

D

`2 sqrt(2) V`

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The correct Answer is:
A
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