Two identical photo-cathodes receive light of frequencies v and `v/2.` If the velocities of the photo electrons (of mass m ) coming out are respectively `V_1 and V_2` then

Options

A. `V_1-V_2=[(2hv)/(m)]^(1//2)`
B. `V_1^2-V_2^2=(hv)/(m)`
C. `V_1+V_2=(2hv)/(m)`
D. `V_1^2+V_2^2=(2h)/(m)(V_1+V_2)`

Answer

B