Radio waves are a type of electromagnet rediation with wavelength in the electromagnetic sprectrum longer than infrared light. Radio waves have frequencies from 300 GHz to as low as 3 kHz, and corresponding wavelengths ranging 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, communication,
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 inosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight.
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