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Stopping Potential

If the work f...

Question

If the work function of a metal is $5 e V$ and photons of energy $20 e V$ are incident on the surface, then the stopping potential of the surface is

A

5 V

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B

10 V

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C

15 V

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D

20 V

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Solution

The correct option is C $15 V$
stopping potential $=$ (incident energy - work function)/e
$= (20 e v - 5 e v) / e$
$= 15 e V / e$
$= 15 V$

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