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Two identical photocathodes receive light of frequencies \( v_{1} \) and \( v_{2} \). If the velocities of the
\( \mathrm{P} \) photoelectrons (of mass \( m \) ) coming out are respectively \( v_{1} \) and \( v_{2} \), then
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(a) \( v_{1}^{2}-v_{2}^{2}=\frac{2 h}{m}\left(v_{1}-v_{2}\right) \)
(b) \( v_{1}+v_{2}=\left[\frac{2 h}{m}\left(v_{1}+v_{2}\right)\right]^{1 / 2} \)
(c) \( v_{1}^{2}+v_{2}^{2}=\frac{2 h}{m}\left(v_{1}+v_{2}\right) \)
(d) \( v_{1}-v_{2}=\left[\frac{2 h}{m}\left(v_{1}-v_{2}\right)\right]^{1 / 2} \)
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