First slide

Electromagnetic waves and its nature

Question

The kinetic energy of a photon of frequency $ϑ$ , rest mass $m_{o}$ , having mass m while moving with velocity v is

Moderate

A

$\frac{1}{2} m v^{2}$
B

$h ϑ$
C

$m c^{2} - m_{0} c^{2}$
D

$\frac{1}{2} m v^{2} - h ϑ$

Solution

The total energy of photon is its kinetic energy, as rest mass energy of a photon is zero. As total energy of a photon $= h ϑ$ . Therefore the kinetic energy of a photon is equal to total energy rest mass energy $= h ϑ - 0 = h ϑ$

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