| 单词 | radio wave |
| 释义 | radio wave (once / 20920 pages) n WORD FAMILY radio wave: radio waves USAGE EXAMPLESPulsars—spinning neutron stars—emit incredibly regular pulses of radio waves. Science Magazine(Dec 22, 2016) Enter radar and lidar, which send out radio waves or light pulses to bounce off objects. Reuters(Mar 31, 2016) So it might come as a surprise to know that space communications rely on an old standby: radio waves. New York Times(Nov 14, 2016) n an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m Syn|Hypo|Hyper radio emission, radio radiation sky wave a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth's surface ground wavea radio wave propagated on or near the earth's surface radio signala radio wave used to transmit and receive messages carrier, carrier wavea radio wave that can be modulated in order to transmit a signal short wavea radio wave with a wavelength less than 100 meters (a frequency greater than 3 megahertz) medium wavea radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kilohertz and 3000 kilohertz) long wavea radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz) ionospheric wavea sky wave that is reflected by the ionosphere electromagnetic radiation, electromagnetic wave, nonparticulate radiation radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge |
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