Concept information
Terme préférentiel
radio wave
Définition(s)
- Radio waves are a type of electromagnetic radiation with the longest wavelengths in the electromagnetic spectrum, typically with frequencies of 300 gigahertz (GHz) and below. At 300 GHz, the corresponding wavelength is 1 mm (shorter than a grain of rice); at 30 Hz the corresponding wavelength is 10,000 kilometers (6,200 miles) (longer than the radius of the Earth). Like all electromagnetic waves, radio waves in a vacuum travel at the speed of light, and in the Earth's atmosphere at a close, but slightly lower speed. Radio waves are generated by charged particles undergoing acceleration, such as time-varying electric currents. Naturally occurring radio waves are emitted by lightning and astronomical objects, and are part of the blackbody radiation emitted by all warm objects. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Radio_wave)
Concept(s) générique(s)
Concept(s) spécifique(s)
Synonyme(s)
- radio emission
- radio radiation
Traductions
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français
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émission radioélectrique
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onde hertzienne
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onde radio
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rayonnement radio
URI
http://data.loterre.fr/ark:/67375/MDL-N2JTH5BP-5
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