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In a photoemissive cell, with exciting w...

In a photoemissive cell, with exciting wavelength `lambda`, the faster electron has speed v. If the exciting wavelength is changed to `3lambda//4`, the speed of the fastest electron will be

A

`v(3/4)^(1/2)`

B

`v(4/3)^(1/2)`

C

less than `v(4/3)^(1/2)`

D

greater than `v (4/3)^(1/2)`

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The correct Answer is:
B
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