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Regarding photons, consider these statements: (I) a photon is a particle of ligh

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1. Regarding photons, consider these statements: (I) a photon is a particle of light, (II) a photon’s rest mass is not defined, and (III) a photon’s speed equals the speed of light. Which are correct?

Only I and II

I, II, III, and a claim that photons carry electric charge

I, II, and III

Only I and III

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Statements I, II, and III are all correct — a photon is a light particle with undefined rest mass, always travelling at light speed. Photons, however, carry no electric charge at all.

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Regarding photons, consider these statements: (I) a photon is a particle of ligh

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Beyond the answer

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