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ultraviolet
(redirected from Ultraviolet A)

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia 0.02 sec.

ultraviolet

An invisible band of radiation at the upper end of the visible light spectrum. With wavelengths from 10 to 400 nm, ultraviolet starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet light is the sun. Although ultraviolet (UV) light is widely known as a disinfectant, it is also used to erase EPROM chips. After several minutes of exposure to UV light, the EPROM can be programmed again.

Ultraviolet in the Spectrum
The ultraviolet band comes after visible light and ends at the beginning of X-rays.


ultraviolet
the part of the electromagnetic spectrum with wavelengths shorter than light but longer than X-rays; in the range 0.4 × 10--6 and 1 × 10--8 metres

ultraviolet [¦əl·trə′vī·lət]
(physics)
Pertaining to ultraviolet radiation. Abbreviated UV.


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Ultraviolet A solar rays, a form of sunlight not blocked by most lotions now on the market, can cause wrinkles, sagging and other damage to skin, according to a study to be published today in the Proceedings of the National Academy of Sciences.
Ultraviolet A rays penetrate deep into the skin and can cause premature aging,
Ultraviolet A are slow-tanning rays, which penetrate deeper into the skin, age the skin and intensify the damaging effects of ultraviolet B.
 
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