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electromagnetic spectrum
phys.sc., el.	speictream leictreamaighnéadach
English thesaurus
electromagnetic spectrum
mil., logist.	The range of electromagnetic radiation groups: electrical waves, Hertzian waves, infrared rays, visible light, ultraviolet rays, X-rays, gamma rays and cosmic rays. Hertzian waves are those waves used for telecommunications. They group the waves used by radio/sound equipment, electro-magnetic waves and satellites. Transmissions through fiber optic use the visible part of the electromagnetic spectrum. (FRA)
USA	The range of frequencies of electromagnetic radiation from zero to infinity. It is divided into 26 alphabetically designated bands (JP 3-13.1) see also electronic warfare