: MeSH: Photons

Physical Phenomena > Elementary Particles > Photons

Physical Phenomena > Radiation > Electromagnetic Radiation > Light > Photons

... > Magnetic Phenomena > Electromagnetic Phenomena > Electromagnetic Radiation > Light > Photons

Physical Phenomena > Optical Phenomena > Light > Photons

Physical Phenomena > Radiation > Radiation, Nonionizing > Light > Photons

Photons

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Discrete concentrations of energy, apparently massless elementary particles, that move at the speed of light. They are the unit or quantum of electromagnetic radiation. Photons are emitted when electrons move from one energy state to another. (From Hawley's Condensed Chemical Dictionary, 11th ed)

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