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

• A. $\frac{E}{p}$
• B. $Ep$
• C. ${\left(\frac{E}{p}\right)}^2$
• D. $3\times {10}^{8}m/s$

Answer 1

The correct option is A

$\frac{E}{p}$

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