Two identical photocathodes receive light of frequencies `f_1` and `f_2`. If the velocities of the photo electrons (of mass m ) coming out are respectively `v_1` and `v_2` thenA. `f_1-f_2=(m(v_1^2-v_2^2))/(2h)`B. `f_1+f_2=(m(v_1^2-v_2^2))/(2h)`C. `f_1-f_2=(m(v_1^2+v_2^2))/(2h)`D. `f_1+f_2=(m(v_1^2+v_2^2))/(2h)`

Two identical photocathodes receive light of frequencies `f_1` and `f_

1.	Two identical photocathodes receive light of frequencies `f_1` and `f_2`. If the velocities of the photo electrons (of mass m ) coming out are respectively `v_1` and `v_2` thenA. `f_1-f_2=(m(v_1^2-v_2^2))/(2h)`B. `f_1+f_2=(m(v_1^2-v_2^2))/(2h)`C. `f_1-f_2=(m(v_1^2+v_2^2))/(2h)`D. `f_1+f_2=(m(v_1^2+v_2^2))/(2h)`
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