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Many fruits, flowers, and seeds stand out more strongly from the background in ultraviolet wavelengths as compared to human color vision.
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Some animals, including birds, reptiles, and insects such as bees, can see into the near ultraviolet. Ultraviolet is colloquially called black light, as it is invisible to the human eye. See 1 E-7 m for a list of objects of comparable sizes. "Vacuum UV" is so named because it is absorbed strongly by air and is used in vacuums. In photolithography, in laser technology, etc., the term deep ultraviolet or DUV refers to wavelengths below 300 nm. The part of the electromagnetic spectrum which ultraviolet light covers can be further subdivided in several different overlapping ways: Name UV light has a shorter wavelength than that of violet light. The name means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the shortest wavelengths of visible light. The terms chemical and heat rays were eventually dropped in favor of ultraviolet and infrared radiation, respectively. The simpler term "chemical rays" was adopted shortly thereafter, and it remained popular throughout the 19th century. He called them "de-oxidizing rays" to emphasize their chemical reactivity and to distinguish them from "heat rays" at the other end of the visible spectrum. In 1801 the German physicist Johann Wilhelm Ritter made the hallmark observation that invisible rays just beyond the violet end of the visible spectrum were especially effective at darkening silver chloride-soaked paper. The discovery of UV radiation was intimately associated with the observation that silver salts darken when exposed to sunlight. 9.21 Reading completely illegible papyruses.9.20 Preparing low surface energy polymers.9.17 Deterring substance abuse in public places.9.16 Curing of inks, adhesives, varnishes and coatings.7 Degradation of polymers, pigments and dyes.6 Human Health Related Effects of UV Radiation.
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#Uva uvb uvc wavelength skin#
Over time, UVA also leads to premature aging and skin cancer. The skin tries to prevent further damage by darkening, resulting in a tan. Exposure causes genetic damage to cells on the innermost part of your top layer of skin, where most skin cancers occur. UVA rays, while slightly less intense than UVB, penetrate your skin more deeply.Early sunscreens only protected your skin from UVB rays, but once it was understood how dangerous UVA rays were, sunscreen manufacturers began adding ingredients to protect you from both UVB and UVA across this broader spectrum. UVA is connected to the “broad-spectrum protection” you see on the labels of sunscreen products.UVA radiation is proven to contribute to the development of skin cancer. There is no such thing as a safe or healthy tan. UVA rays cause tanning, and the shorter wavelengths of UVA also cause sunburn.You can easily reduce your likelihood of developing skin cancer by protecting yourself against UV radiation.If you live where the sun is strong year-round, your exposure level and risk increases.
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The UV index measures the intensity of UV radiation at a specific location.