Question

A photon in motion has a mass equal to​

Answer 1

Answer:

 It has energy and energy is equivalent to mass. Photons are traditionally said to be massless. This is a figure of speech that physicists use to describe something about how a photon's particle-like properties are described by the language of special relativity.

Answer 2

Answer:

Well, by definition a photon (a uniparticle state of the quantized e-m field) is massless, i.e. has mass = 0. There is no photon at rest, so that "photon in motion" is a linguistic mistake called pleonasm.

Explanation:

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