Q. The energy of a photon is $E = hv$ and the momentum of photon $p = \frac{h}{\lambda},$ then the velocity of photon will be
A) $E/p$
B) $Ep$
C) $\left( \frac{E}{p} \right)^{2}$
D) $3 \times 10^{8}m/s$
Explanation
(a) Momentum of photon $p = \frac{E}{c}$
$\Rightarrow$ Velocity of photon $c = \frac{E}{p}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.