Should the energy of a photon be called its kinetic energy or its internal energy?
In Physics, the Energy-Momentum relation of a particle is given by
=Energy;
=Momentum;
=Velocity of light;
=rest mass of particle. For Photon,
=0 and thus
. Since momentum is associated with the energy of photon, we call the energy of photon as its kinetic energy and not its internal energy.