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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 is to be increased to `2 E` , the wavelength must be changed to `lambda'` where

A

`lambda'=lambda/2`

B

`lambda'=lambda2`

C

`lambda/2 lt lambda' lt lambda`

D

`lambda' gt lambda`

Text Solution

Verified by Experts

The correct Answer is:
C
`(hc)/lambda_(1)gt(hc)/lambda` and `(2hc)/lambda_(1)gt(hc)/lambda_(1)`
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