Kleppner, Daniel Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts.
Last reviewed:February 2019
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- Wave-particle duality
- Particlelike behavior
- Quantum theory
- Technological applications
- Links to Primary Literature
- Additional Readings
An elementary particle that is the force carrier of the electromagnetic force and a quantum of electromagnetic radiation, also known as light. Photons are the most common elementary particle in the universe described by the standard model of particle physics. Having zero rest mass, photons always move at their namesake speed of light, which in a vacuum is 299,792,458 m/s, irrespective of their energy (Fig. 1). See also: Electromagnetic radiation; Electromagnetism; Elementary particle; Energy; Light; Mass; Standard model; Universe
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