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ultraviolet (UV)
Electromagnetic radiation beyond the violet with wavelengths in the approximate range 10–400 nanometers (100 Å to 4,000 Å). The near ultraviolet (the long wavelength end of the range) extends from just beyond the violet end of the visible spectrum to about 2,000 Å. The far ultraviolet stretches from 2,000 Å to the Lyman limit (see Lyman series) at 912 Å. Beyond this, from the Lyman limit to the start of the X-ray regime at about 100 Å lies the extreme ultraviolet.
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