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Two identical photocathodes receive the light of frequencies \( f_{1} \) and \( f_{2} \) respectively. If the velocities of
\( \mathrm{P} \) the photo-electrons coming out are \( v_{1} \) and \( v_{2} \)

W respectively, then
[JEEMain-2021 (March)]
(a) \( v_{1}-v_{2}=\left[\frac{2 k}{m}\left(f_{1}-f_{2}\right)\right]^{\frac{1}{2}} \)
(b) \( v_{1}^{2}+v_{2}^{2}=\frac{2 k}{m}\left[f_{1}+f_{2}\right] \)
(c) \( v_{1}+v_{2}=\left[\frac{2 k}{m}\left(f_{1}+f_{2}\right)\right]^{\frac{1}{2}} \)
Physics Wallat
(d) \( v_{1}^{2}-v_{2}^{2}=\frac{2 k}{m}\left[f_{1}-f_{2}\right] \)
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