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  • What is meant by a quantum of light?
Multiple choice

What is meant by a quantum of light?

  1. Electron

  2. Proton

  3. Neutron

  4. Photon

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D Correct answer
Explanation

A photon is a quantum of light - a discrete packet of electromagnetic energy. Electrons, protons, and neutrons are subatomic particles with mass, while photons are massless energy packets.

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