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photon definition - telecom
  1. A quantum of electromagnetic energy, a photon is a subatomic particle that has energy and momentum, but no mass or electric charge. A photon demonstrates wave and particle properties when in motion, but demonstrates no physical properties when at rest. See also electromagnetic spectrum and wave.
  2. A unit of light intensity at the retina equal to the illumination of one candle per square meter received through a pupil area of one square millimeter. See also candle and light.

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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