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Two identical photocathodes receive the ...

Two identical photocathodes receive the light of frequencies `f_(1)` and `f_(2)` respectively. If the velocities of the photo-electrons coming out are `v_(1)` and `v_(2)` respectively, then

A

`v_(1)^(2)-v_(2)^(2)=(2h)/(m)[f_(1)-f_(2)]`

B

`v_(1)+v_(2)=[(2h)/(m)(f_(1)+f_(2))]^((1)/(2))`

C

`v_(0)-v_(2)=[(2h)/(m)(f_(1)-f_(2))]^((1)/(2))`

D

`v_(1)^(2)+v_(2)^(2) = (2h)/(m) [f_(1)+f_(2)]`

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