The infrared wavelength region runs from about 1 nm to 1 mm. Wavelengths of visible light are several hundred nanometers. The diameter of a hydrogen atom is roughly 0.1 nm. By convention the ultraviolet region extends from about 10 to 300 nm. It consists of the familiar colors red, orange, yellow, green, blue, and violet.
Hotter bodies radiate more intensely at shorter wavelengths.
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