| electromagnetic spectrum n. The entire range of radiation extending in frequency from approximately 1023 hertz to 0 hertz or, in corresponding wavelengths, from 10-13 centimeter to infinity and including, in order of decreasing frequency, cosmic-ray photons, gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves. |   electromagnetic spectrum frequencies in hertz A. gamma rays B. x-rays C. ultraviolet rays D. visible light E. infrared rays F. microwaves G. radio waves |
| electromagnetic spectrum The entire range of electromagnetic radiation. At one end of the spectrum are gamma rays, which have the shortest wavelengths and high frequencies. At the other end are radio waves, which have the longest wavelengths and low frequencies. Visible light is near the center of the spectrum. |  |
The range of frequencies of electromagnetic radiation from zero to infinity. It is divided into 26 alphabetically designated bands. See also electronic warfare.
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | electromagnetic spectrum - the entire frequency range of electromagnetic waves radio frequency - an electromagnetic wave frequency between audio and infrared extremely low frequency, ELF - below 3 kilohertz very low frequency, VLF - 3 to 30 kilohertz LF, low frequency - 30 to 300 kilohertz medium frequency, MF - 300 to 3000 kilohertz high frequency, HF - 3 to 30 megahertz very high frequency, VHF - 30 to 300 megahertz UHF, ultrahigh frequency - 300 to 3000 megahertz SHF, superhigh frequency - 3 to 30 gigahertz EHF, extremely high frequency - 30 to 300 gigahertz spectrum - an ordered array of the components of an emission or wave actinic radiation, actinic ray - electromagnetic radiation that can produce photochemical reactions gamma radiation, gamma ray - electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength infrared spectrum - the spectrum of infrared radiation light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window" line - a single frequency (or very narrow band) of radiation in a spectrum microwave - a short electromagnetic wave (longer than infrared but shorter than radio waves); used for radar and microwave ovens and for transmitting telephone, facsimile, video and data microwave spectrum - the part of the electromagnetic spectrum corresponding to microwaves radio spectrum, radio-frequency spectrum - the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television ultraviolet spectrum - the spectrum of ultraviolet radiation color spectrum, visible spectrum - the distribution of colors produced when light is dispersed by a prism |
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