If the work function of the metal is W and the frequency of the incident light is v , then there is no emission of photo-electrons if

v < W / h

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v > W / h

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v \geq W / h

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v \leq W / h

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Solution

The correct option is A $v < W / h$
Maximum Kinetic Energy $= h ν - ϕ$
$= h ν - W$
Since there is no emission
So, $h ν - W < 0$
or $ν < \frac{W}{h}$

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