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Light of wavelength lambda strikes a pho...

Light of wavelength `lambda` strikes a photo - sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to `2 E` , the wavelength must be changed to `lambda'` where

A

`lambda'=lambda/2`

B

`lambda'=2lambda`

C

`lambda/2ltlambda'`

D

`lambda'gtlambda`

Text Solution

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The correct Answer is:
C
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