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

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

Dual Nature of Radiation and Matter

Solution:

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