Question

In a photoemissive cell with exciting wavelength , the fastest electron has speed . If the exciting wavelength is changed by , the speed of the fastest emitted electron will be :

A

B

C

less than

D

greater than

Medium
Solution
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Correct option is D)

From
where
If wavelength of incident light charges from to (Decreases)
Let energy of incident light charges from and speed of fastest electron changes from to then
As
Hence
So,

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