Answer :

All photons of a light of particular wavelength have same energy and same linear momentum. This says that all photons travel with equal velocity which is equal to velocity of light. If the two photons are going in the same direction, then the relative speed between them will be zero since both are travelling in same direction with velocity of light. If the two photons are going in opposite directions, the relative speed between them will be equal to the velocity of light.


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