Sunlight rays:UV
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What is ultraviolet (UV) radiation? - American Cancer Society  Mar 20, 2015 ... Exposure to ultraviolet (UV) radiation is a major risk factor for most skin cancers. Sunlight is the main source of UV rays. Tanning lamps and...
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UVA & UVB - SkinCancer.org  May 24, 2013 ... The center of this confusion is the sun's ultraviolet A (long-wave) and ultraviolet B (shortwave) rays. Our understanding of exactly what kinds of...
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What Is Ultraviolet Light? - Live Science  Mar 31, 2015 ... Ultraviolet light is a type of electromagnetic radiation, as are radio waves, infrared radiation, X-rays and gamma-rays. UV light, which comes...
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Ultraviolet Waves - Mission:Science  Ultraviolet (UV) light has shorter wavelengths than visible light. ... UV-C rays are the most harmful and are almost completely absorbed by our atmosphere. UV-B...
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Ultraviolet - Wikipedia  Ultraviolet (UV) is an electromagnetic radiation with a wavelength from 10 nm (30 PHz) to 400 ... Small birds have a fourth color receptor for ultraviolet rays; this gives birds "true" UV vision. .... The Sun emits ultraviolet radiation at all wavelengths, including the extreme ultraviolet where it crosses into X-rays at 10 nm.
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Solarisation - Wikipedia  Solarisation (or solarization) is a phenomenon in photography in which the image recorded on a negative or on a photographic print is wholly or partially reversed in tone. Dark areas appear light or light areas appear dark. The term is synonymous with the Sabattier effect when referring to negatives. ... In modern film photography, this effect can be emulated for artistic effect by...
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Sunlight - Wikipedia  Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through Earth's atmosphere, and is obvious as ... 8 Variations in solar irradiance. 8.1 Seasonal ... Sunlight takes about 8.3 minutes to reach Earth from the surface of the Sun.
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Sun tanning - Wikipedia  Sun tanning or simply tanning is the process whereby skin color is darkened or tanned. It is most often a result of exposure to ultraviolet (UV) radiation from sunlight or from artificial sources, such as a tanning lamp. People who deliberately tan their skin by exposure to the sun engage in a .... A person's natural skin color affects their reaction to exposure to the sun.
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What Are X-Rays? - Live Science  Mar 12, 2015 ... Soft X-rays fall in the range of the EM spectrum between (UV) light and ... The only difference between them is their source: X-rays are...
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Safe sunnies: Which pair should I wear? | Product Safety Australia  Dec 1, 2014 ... Clothing & accessories ... Some sunglasses may be unsafe to wear while driving  avoid ... These sunglasses provide a medium level of sun glare reduction and good UV ... in direct sunlight, sunlight reflection on the water at the beach). ... depending on the time it takes for the tint on those lenses to change.
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optics - Is a quartz lens necessary to prevent UV blocking on full ...  May 18, 2015 ... It's true that most lenses don't transmit very much UV light, however, it's not true ... I am not sure what the spectral transmission of glass is at 250nm but you can ... Eg, you would take a camera and then use a series of different light ... that is illuminated by the UV light to make sure that the lens can not only...
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Atmospheric Effects - GIO Ground It Out  The atmosphere is all that protects us from the heat of the Sun and the potentially ... It was discovered that this fragile shield is made up of several distinct layers. ... The next layer, the stratosphere, extends to about 30 miles (50km) above the Earth's ... The Sun's rays, including X-rays and ultraviolet radiation, pass into the...
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Ozone Depletion Essay - 1702 Words - StudyMode  Jun 27, 2013 ... Ozone (/ozon/; O3), or trioxygen, is a triatomic molecule, consisting of three oxygen atoms. It is an allotrope of oxygen that is much less stable than the diatomic ... biologically harmful ultraviolet (UV) radiation coming from the sun. .... It protects life on earth from the full force of the sun's cancer-causing...
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Nuclear Winter - UW Atmospheric Sciences  Dec 23, 1983 ... tion from nuclear blast, fires, and fallout and the later enhancement oi radiation due to ozone depletion, long-term exposure to cold, dark,; could...
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SOHO - NASA  Chromosphere (see image of "Parts of the Sun"): The layer of the solar atmosphere that is ... In this region convection currents circulate the Sun's energy to the surface. ... Electromagnetic Spectrum: The entire range of all the various kinds or wavelengths of ... Filaments seen over the limb are also known as prominences.
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The Electromagnetic Spectrum - Gamma Rays, X-rays, Ultraviolet ...  ... spectrum, including gamma rays, x-rays, ultraviolet light, visible light, infrared light, ... Descriptions of each of these is given, including their wavelength and...
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Sun Safety | American Skin Association  The sun gives off invisible rays of ultraviolet light. ... that are absorbed by the epidermis, the outermost layer of the skin. ... Other UVB rays can affect the immune system and interfere with the skin's ability ... a filter against the sun's rays actually damage the DNA of the pigment cells. ... Reduce your risk by protecting your skin.
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Overview of Vitamin D - Dietary Reference Intakes for Calcium and ...  Flow diagram showing that sunlight on the skin is the first step in vitamin D .... from 7-dehydrocholesterol following exposure to ultraviolet B (UVB) radiation with...
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UV Index | The Weather Channel  Jan 13, 2015 ... The National Weather Service forecasts the amount of ultraviolet ... Here are some of the factors that may affect your exposure to ultraviolet radiation. ... In the continental U.S., the intensity is reduce by about 50% some three hours ... Also, the type of reflective surface can determine the amount of exposure.
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The Tanning Process  Sample Tanning Forms ... Human skin is composed almost entirely of water and organic molecules. ... The cells involved primarily in the tanning process are called melanocytes. ... and UVB radiation through a chemical reaction darkening the pigmentation of the skin. ... The first one is immediate pigment darkening (IPD).
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Ultraviolet germicidal irradiation - Wikipedia  Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions. ... Exposure comes from germicidal lamps that emit germicidal UV...