The maximum velocity of an electron emitted by light of wavelength $\lambda$ incident on the surface of a metal of work function $\phi$ is [Where $h =$ Planck's constant,$m =$ mass of electron,and $c =$ speed of light].
- A$[\frac{2(hc + \lambda \phi)}{m \lambda}]^{1/2}$
- B$\frac{2(hc + \lambda \phi)}{m}$
- C$[\frac{2(hc - \lambda \phi)}{m \lambda}]^{1/2}$
- D$[\frac{2(h \lambda - \phi)}{m}]^{1/2}$
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