Question

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

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

Answer 1

Answer: (A)

$\frac{hx}{c^2}$

Answer 2

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