photon

photon
   1. a quantum of light energy, or, more generally, of any form of electromagnetic energy having a single wavelength, direction, and polarization.
   2. a former name for the unit of retinal illuminance now called the troland.

Dictionary of units of measurement. 2015.

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  • photon — unit of electromagnetic radiation, 1926, from PHOTO (Cf. photo ) light + ON (Cf. on) unit …   Etymology dictionary

  • photon —  Photon  Фотон   Квант электромагнитного излучения, нейтральная элементарная частица с нулевой массой покоя и спином 1; переносчик электромагнитного взаимодействия между заряженными частицами. Может находиться только в двух спиновых состояниях …   Толковый англо-русский словарь по нанотехнологии. - М.

  • photon — ► NOUN Physics ▪ a particle representing a quantum of light or other electromagnetic radiation. DERIVATIVES photonic adjective …   English terms dictionary

  • photon — ☆ photon [fō′tän΄ ] n. [ PHOT(O) + (ELECTR)ON] 1. Particle Physics a subatomic particle, having energy and momentum but no mass or electric charge, that is the quantum unit of electromagnetic radiation, including light: see also CLASSON 2. a unit …   English World dictionary

  • Photon — This article is about the elementary particle of light. For other uses, see Photon (disambiguation). Photon Photons emitted in a coherent beam from a laser Composition Elementary particle …   Wikipedia

  • photon — /foh ton/, n. a quantum of electromagnetic radiation, usually considered as an elementary particle that is its own antiparticle and that has zero rest mass and charge and a spin of one. Symbolically represented by the small greek letter Gamma.… …   Universalium

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