Photo Electric Effect

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Question

Light of frequency 1.5 times the threshold frequency is incident on a photo sensitive material, photo electric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

Easy

Solution

${\nu _1} = 1.5{\nu _o};$
$\therefore {\nu _1} > {\nu _o} \to PEE;{I_1} = I$
${\nu _2} = 0.75{\nu _o}\,;$
$\,\therefore {\nu _2} < {\nu _o} \to no\,PEE$
$\therefore {I_2} = 0(\because noPEE)\$

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