Question

The relation between energy E and momentum p of a photon is

• A. $E=pc$
• B. $E=\frac{p}{c}$
• C. $p=Ec$
• D. $E=\frac{p^2}{c}$

Answer 1

The correct option is A $E=pc$

The energy of a photon in vacuum is equal to $E=pc$ (where p is the momentum of the photon, and c is the speed of light in vacuum)

So, the answer is option (A).