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==Origin==
==Origin==
The name means "beyond violet" (from [[Latin]] ultra, "beyond"), violet being the [[color]] of the shortest [[wavelengths]] of visible [[light]]. UV light has a shorter wavelength than violet light.
The name means "beyond violet" (from [[Latin]] ultra, "beyond"), violet being the [[color]] of the shortest [[wavelengths]] of visible [[light]]. UV light has a shorter wavelength than violet light.
*[http://en.wikipedia.org/wiki/19th_century 1840]
*[https://en.wikipedia.org/wiki/19th_century 1840]
==Definition==
==Definition==
*1: situated beyond the visible [[spectrum]] at its [[violet]] end —used of [[radiation]] having a [[wavelength]] shorter than wavelengths of visible [[light]] and longer than those of [http://en.wikipedia.org/wiki/x-ray X-rays]
*1: situated beyond the visible [[spectrum]] at its [[violet]] end —used of [[radiation]] having a [[wavelength]] shorter than wavelengths of visible [[light]] and longer than those of [https://en.wikipedia.org/wiki/x-ray X-rays]
==Description==
==Description==
'''Ultraviolet''' (UV) [[light]] is [[electromagnetic]] [[radiation]] with a [[wavelength]] shorter than that of visible light, but longer than [https://en.wikipedia.org/wiki/X-ray X-rays], that is, in the range between 400 nm and 10 nm, corresponding to photon energies from 3 eV to 124 eV. It is so-named because the spectrum consists of electromagnetic waves with [[frequencies]] higher than those that humans identify as the color [[violet]]. These frequencies are invisible to most humans except those with [https://en.wikipedia.org/wiki/Aphakia aphakia]. Near-UV is visible to a number of insects and birds.
'''Ultraviolet''' (UV) [[light]] is [[electromagnetic]] [[radiation]] with a [[wavelength]] shorter than that of visible light, but longer than [https://en.wikipedia.org/wiki/X-ray X-rays], that is, in the range between 400 nm and 10 nm, corresponding to photon energies from 3 eV to 124 eV. It is so-named because the spectrum consists of electromagnetic waves with [[frequencies]] higher than those that humans identify as the color [[violet]]. These frequencies are invisible to most humans except those with [https://en.wikipedia.org/wiki/Aphakia aphakia]. Near-UV is visible to a number of insects and birds.
