Question

The mass of a photon in motion is (given its frequency = x )

• A. $\frac{hx}{c^2}$
• B. $h{x}^3$
• C. $\frac{h{x}^3}{c^2}$
• D. zero

Answer 1

Answer: (A)

By Einstein's mass energy equivalence
$E=m{c}^2$
but $E=hx$
$\therefore hx=m{c}^2$
$\Rightarrow m=\frac{hx}{c^2}$