Definition: The forms of radiant energy arranged by size of wavelength ranging from billionths of a millimeter (gamma rays) to several miles (radio waves). The visible spectrum is the part that the human eye sees as light: wavelengths of 400 to 700 nanometers (billionths of a meter) producing the sensation of the colors violet, blue green, yellow, and red.
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Friday, March 21, 2008
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