what is mean by ultraviolet?
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"Ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the highest frequencies of visible light. Ultraviolet has a higher frequency (and thus a shorter wavelength) than violet light.
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ultraviolet radiation. Listen to pronunciation. (UL-truh-VY-oh-let RAY-dee-AY-shun) Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation that reaches the Earth's surface is made up of two types of rays, called UVA and UVB.
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While IR represents electromagnetic radiation with wavelengths longer than those of visible light, UV represents wavelengths shorter than visible light. ... The UV radiation, on the other hand, covers the wavelength range of 400 nm (violet edge) to 10 nm.
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Ultraviolet Radiation Definition. Ultraviolet radiation is electromagnetic radiation or light having a wavelength greater than 100 nm but less than 400 nm. ... Although ultraviolet light is energetic enough to break some chemical bonds, it is not (usually) considered a form of ionizing radiation.
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The UV Index represents the amount of skin-damaging UV radiation reaching the earth's surface at any instant of time. The basic UV Index forecast is given for solar noon — the sun's highest point in the sky and the time of the highest fluctuation in UV radiation (under clear sky conditions).
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Ultraviolet light (UV) is a strong mutagen (in the wavelength that DNA absorbs, roughly 225-300 nm) and primarily generates dimers between adjacent pyrimidine bases on the same DNA strand. ... The effects of mutagenesis can be reversed by photoreactivation, a light-dependent DNA repair mechanism.
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Ultraviolet lamp, also called Black-light Lamp, device for producing electromagnetic radiations in the wavelengths between those of visible light and X-rays. ... Ultraviolet lamps are usually housed in quartz or special glass that transmits ultraviolet radiation more readily than ordinary glass.
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Summary – UV vs Visible Spectrophotometer The UV-visible spectrophotometer is an instrument that uses the absorption spectroscopic techniques to quantify the analytes in a sample. There is no difference between UV and visible spectrophotometer because both names refer to the same analytical instrument.
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1. ultraviolet illumination - radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays. ultraviolet, ultraviolet light, ultraviolet radiation, UV. actinic radiation, actinic ray - electromagnetic radiation that can produce photochemical reactions.
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Ultraviolet radiation (UVR) is defined as the portion of the electromagnetic spectrum between 100 nanometers (nm) and 400nm. ... UVA - Ultraviolet radiation in the range 315nm to 400nm is thought to contribute to premature aging and wrinkling of the skin and has recently been implicated as a cause of skin cancer.
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Ultraviolet (UV) light falls in the range of the EM spectrum between visible light and X-rays. It has frequencies of about 8 × 1014 to 3 × 1016 cycles per second, or hertz (Hz), and wavelengths of about 380 nanometers (1.5 × 10−5 inches) to about 10 nm (4 × 10−7 inches).
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Ultraviolet radiation - UV - is found naturally in sunlight. We cannot see or feel ultraviolet radiation, but our skin responds to UV exposure by turning darker over time. This is called a sun tan.
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adjective. beyond the violet in the spectrum, corresponding to light having wavelengths shorter than 4000 angstrom units. pertaining to, producing, or utilizing light having such wavelengths: an ultraviolet lamp.
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Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency of approximately 30 PHz) to 400 nm (750 THz), shorter than that of visible light but longer than X-rays. ... Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact.
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Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. ... The common designations are radio waves,microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma-rays.
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An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent: the marks can be seen only under an ultraviolet light. They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes.
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(UL-truh-VY-oh-let RAY-dee-AY-shun) Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation that reaches the Earth's surface is made up of two types of rays, called UVA and UVB. Ultraviolet radiation also comes from sun lamps and tanning beds.