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The rest mass of a photon is equal to ___________

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The rest mass of a photon is equal to ___________

(a) Gravitational mass

(b) Relativistic mass

(c) Inertial mass

(d) Zero

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Query is from Mass Variation with Velocity topic in division Ultrasonics & Relativity of Engineering Physics I

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Correct answer is (d) Zero

Easy explanation: A photon is defined as a quantum of energy. It travels with the sped of light and is said to have no rest mass.

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