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The site explains the basic of the electromagnetic spectrum and the various wavelengths of which it is composed (Radio Waves, Microwaves , Infrared, the Visible Spectrum, Ultraviolet, Gamma Rays, ...
NASA page about electromagnetic waves with descriptions of such waves and their uses.Covers radio waves, microwaves, infrared, visible light, ultraviolet (UV), x-rays and gamma rays.
Radio transmission involves putting audio frequency information on a much higher frequency electromagnetic wave called a carrier wave.
The key to classifying a galaxy as a Seyfert Galaxy is the presence of broad emission lines from the bright, star-like nucleus. They are often strong radio and infrared sources. The first such active ...
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