electromagnetic spectrum

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electromagnetic spectrum

n. The entire range of radiation extending in frequency from approximately 10²³ hertz to 0 hertz or, in corresponding wavelengths, from 10^-13 centimeter to infinity and including, in order of decreasing frequency, cosmic-ray photons, gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves.

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The American Heritage® Dictionary of the English Language, Fourth Edition
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