Short Note

Should the energy of a photon be called its kinetic energy or its internal energy?

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#### Solution

Relativistic equation of energy :

`E^2 = p^2c^2 + m^2c^4` ....(1)

Here, p^{2}c^{2} = kinetic energy of photon

m_{0}^{2}c^{4} = internal energy of photon

We know photons have zero rest mass. Therefore, m_{0} = 0. Substituting the value of m_{0} = 0 in equation (1), we get : `E = pc`

Thus, the energy of a photon should be called its kinetic energy.

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