| 释义 |
DictionarySeeradio waveradio waves
 Radio Waves radio waves Traveling electromagnetic disturbances whose frequencies lie in the radio region of the electromagnetic spectrum, extending from about 20 kilohertz to over 300 gigahertz, the highest frequencies corresponding to millimeter and submillimeter wavelengths. Radio astronomy may in principle be carried out at any radio frequency but in practice observations are confined to certain ‘radio-astronomy bands' set aside for that purpose by international agreement to minimize interference from other services (see table). These bands lie within the radio window (see atmospheric windows).Radio waves
Radio wavesElectromagnetic energy of the frequency range corresponding to that used in radio communications, usually 10,000 cycles per second to 300 billion cycles per second. Radio waves are the same as visible light, x rays, and all other types of electromagnetic radiation, but are of a higher frequency.Mentioned in: Magnetic Resonance Imaging |