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

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10v

15 v

20 v

answer is C.

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Detailed Solution

Given Data:

The work function of a metal is 5eV and photons of energy 20 eV .

Formula Used:

$s t o p p i n g p o t e n t i a l = (i n c i d e n t e n e r g y - w o r k f u n c t i o n) / e$

Detailed Solution: $s t o p p i n g p o t e n t i a l = (i n c i d e n t e n e r g y - w o r k f u n c t i o n) / e$

$= (20 e v - 5 e v) / e$

$= 15 e V / e$
$= 15 V$

Hence,the correct option is C.

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