Photons of wavelength $\lambda$ are incident on the cathode of a photocell. Electrons are emitted from the cathode surface. The de-Broglie wavelength of the emitted electrons is (work function is negligible).
($c =$ velocity of light,$h =$ Planck's constant,$m =$ mass of electron)
($c =$ velocity of light,$h =$ Planck's constant,$m =$ mass of electron)
- A$\sqrt{\frac{mc}{2h\lambda}}$
- B$\sqrt{\frac{h\lambda}{2mc}}$
- C$\sqrt{\frac{2h\lambda}{mc}}$
- D$\sqrt{\frac{mh}{\lambda c}}$
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