Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies from 300 GHz to as low as 3 kHz, and corresponding wavelengths from 1 millimeter to 100 kilometers. Like all other electromagnetic waves, they travel at the speed of light. Naturally occurring radio waves are made by lightning, or by astronomical objects. Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, communications satellites, computer networks and innumerable other applications. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight.
Read more about Radio Waves: Discovery and Utilization, Propagation, Speed, Wavelength and Frequency, Radio Communication, In Medicine
Famous quotes containing the words radio and/or waves:
“England has the most sordid literary scene Ive ever seen. They all meet in the same pub. This guys writing a foreword for this person. They all have to give radio programs, they have to do all this just in order to scrape by. Theyre all scratching each others backs.”
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