First slide

Photo Electric Effect

Question

If the frequency of incident light is tripled, the stopping potential will

Moderate

A

be tripled
B

become one third
C

become more than triple
D

become less than triple but more than double

Solution

eV= h( $ν$ - $ν_{0}$ )
When frequency of incident light in tripled,
e $V^{'}$ = h(3 $ν$ - $ν_{0}$ )
= h( $ν$ - $ν_{0}$ ) + 2h $ν$
= eV + 2h $ν$
Since h $ν$ > eV
Thus, $V^{'}$ > V

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