If $$\lambda_0$$ and $$\lambda$$ are the threshold wavelength and the wavelength of the incident light, respectively on a metal surface, the velocity of the photoelectron ejected from the metal surface is ($$m_e$$ = mass of electron, h = Planck's constant, c = speed of light)

A

$$\sqrt{\frac{2h(\lambda_0 - \lambda)}{m_e}}$$

B

$$\sqrt{\frac{2hc(\lambda_0 - \lambda)}{m_e}}$$

C

$$\sqrt{\frac{2hc}{m_e}\left(\frac{\lambda_0 - \lambda}{\lambda \lambda_0}\right)}$$

D

$$\sqrt{\frac{2h}{m_e}\left(\frac{1}{\lambda_0} - \frac{1}{\lambda}\right)}$$