Massless packet of energy, which behaves like both a wave and a particle. In the duality of mass/energy this is considered a particle of radiation. The carrier particle of the electromagnetic force. Electromagnetic radiation, such as light, can be thought of as beingcomposed of photons.

Einstein′s generalization of the concept of the quantum introduced by Max Planck.

Photons cannot travel faster than the speed of light.


The energy of a photon of electromagnetic radiation is the product of h (Planck′s constant) and the radiation frequency.


Shanchao Zhang, J. F. Chen, Chang Liu, M. M. T. Loy, G. K. L. Wong, and Shengwang Du, "Optical Precursor of a Single Photon", Phys. Rev. Lett. 106, 243602 (2011)

See also: Eddington Limit, Fundamental Particle, Luxon, Plancks Constant, Stimulated Emission, Wave Particle Duality.

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Subjects: Optics Physics