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The maximum velocity of an electron emitted by light of wavelength \( \lambda \) incident on the surface of a metal of work function \( \phi \), is
[MP PMT/PET 1998, MP PMT 2003]
(a) \( \left[\frac{2(h c+\lambda \phi)}{m \lambda}\right]^{1 / 2} \)
(b) \( \frac{2(h c-\lambda \phi)}{m} \)
(c) \( \left[\frac{2(h c-\lambda \phi)}{m \lambda}\right]^{1 / 2} \)
(d) \( \left[\frac{2(h \lambda-\phi)}{m}\right]^{1 / 2} \)
Where \( h= \) Planck's constant, \( m= \) mass of electron and \( c= \) speed of light
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