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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

2V

B

4V

C

6V

D

`2sqrt2V`

Text Solution

Verified by Experts

The correct Answer is:
A
`eV_0 = E -phi_0 impliesV_0 = (4eV -2eV)/(e) =2V`
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