alleryThe equivalent mass of a photon of frequency $\nu$ is
A$m=\dfrac{h\nu}{c^2}$
B$m=\dfrac{h\nu}{c}$
C$m=\dfrac{c^2}{h\nu}$
D$m=h\nu c^2$
Answer & Solution
Correct answer: A. $m=\dfrac{h\nu}{c^2}$
Using Einstein's mass-energy relation $E=mc^2$ and photon energy $E=h\nu$, we get $mc^2=h\nu$, so $m=\dfrac{h\nu}{c^2}$.
This is the equivalent mass associated with photon energy.
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