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Question

Question: Momentum of a photon of wavelength λ is....

Momentum of a photon of wavelength λ is.

A

hλ\frac{h}{\lambda}

B

Zero

C

hλc2\frac{h\lambda}{c^{2}}

D

hλc\frac{h\lambda}{c}

Answer

hλ\frac{h}{\lambda}

Explanation

Solution

Sincehν=mc2h\nu = mc^{2}, hence p=mc=hνc=hλp = mc = \frac{h\nu}{c} = \frac{h}{\lambda}