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  4. The energy of a photon is E=h v and the momentum of photon p=(h/λ), then the velocity of photon will be

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Q. The energy of a photon is $E=h v$ and the momentum of photon $p=\frac{h}{\lambda}$, then the velocity of photon will be

Dual Nature of Radiation and Matter

Solution:

Momentum of photon $p=\frac{E}{c}$
$\Rightarrow $ Velocity of photon $c=\frac{E}{p}$