The maximum velocity of an electron emitted by light of wavelength $\lambda$ incident on the surface of a metal of work function W₀  is

• A

  ${\left[\frac{2\mathrm{hc}+{\mathrm{\lambda W}}_0}{\mathrm{m\lambda }}\right]}^{1/2}$

• B

  $\frac{2\left(\mathrm{hc}-{\mathrm{\lambda W}}_0\right)}{\mathrm{m}}$

• C

  ${\left[\frac{2\left(\mathrm{hc}-{\mathrm{\lambda W}}_0\right)}{\mathrm{m\lambda }}\right]}^{1/2}$

• D

  ${\left[\frac{2\left(\mathrm{hc}-{\mathrm{W}}_0\right)}{\mathrm{m}}\right]}^{1/2}$