Dual Nature Of Light Question 218

Question: The energy of a photon is $ E=hv $ and the momentum of photon $ p=\frac{h}{\lambda } $ , then the velocity of photon will be [CPMT 1991]

Options:

A) E/p

B) Ep

C) $ {{( \frac{E}{p} )}^{2}} $

D) $ 3\times 10^{8}m/s $

Show Answer

Answer:

Correct Answer: A

Solution:

Momentum of photon $ p=\frac{E}{c} $
$ \Rightarrow $ Velocity of photon $ c=\frac{E}{p} $