what is ultraviolet rays meaning?
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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.
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Visible rays – visible light emitted or reflected by objects. Ultraviolet rays – produced by special lamps and very hot bodies, like the sun. X-rays – produced by bombarding a metal target with high energy electrons. Gamma rays – produced in nuclear reactions and also emitted by radioactive nuclei.
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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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Ultraviolet (UV) radiation is defined as that portion of the electromagnetic spectrum between x rays and visible light, i.e., between 40 and 400 nm (30–3 eV). ... UVC is almost never observed in nature because it is absorbed completely in the atmosphere, as are Far UV and Vacuum UV.
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The UVI is a measure of the level of UV radiation. The values of the index range from zero upward - the higher the UVI, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur. The UVI is an important vehicle to alert people about the need to use sun protection.
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Medical Definition of Ultraviolet radiation Ultraviolet radiation: Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation can burn the skin and cause skin cancer. ... Scientists have long thought that ultraviolet B can cause melanoma and other types of skin cancer.
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Synonyms. sunray actinic radiation ultraviolet light ultraviolet illumination ultraviolet actinic ray UV sun-ray.
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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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UVB radiation. Also known as the "burning rays" because UVB wavelengths cause burning of the skin as well as cancer. Wavelengths are shorter and stronger and more damaging then UVA rays.
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Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, that is, in the range 10 nm to 400 nm, corresponding to photon energies from 3 eV to 124 eV (1 eV = 1.6e-19 J; EM radiation with frequencies higher than those of visible light are often ...
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Ultraviolet radiation is electromagnetic radiation or light having a wavelength greater than 100 nm but less than 400 nm. It is also known as UV radiation, ultraviolet light, or simply UV. ... The word "ultraviolet" means "beyond violet".
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Ultraviolet and infrared radiation are both electromagnetic radiation. Ultraviolet has a shorter wavelength (and the photons are more energetic) than visible light. Infrared has a longer wavelength and less energetic photons. ... Ultraviolet: Shorter wavelength than visible light, higher frequency, higher energy.
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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. However, too much exposure to UV radiation is damaging to living tissue.
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Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the "electromagnetic spectrum". Radiated energy, or radiation, is given off by many objects: a light bulb, a crackling fire, and stars are some examples of objects which emit radiation.
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Definition of ultraviolet spectrum. : a spectrum of ultraviolet radiation characterized by short wavelengths and high quantum energies as compared to visible light.
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The UV Index is a forecast of the amount of skin damaging UV radiation expected to reach the earth's surface at the time when the sun is highest in the sky (around midday). ... The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the two weeks around the summer solstice).
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The sun is a major source of ultraviolet rays. Though the sun emits all of the different kinds of electromagnetic radiation, 99% of its rays are in the form of visible light, ultraviolet rays, and infrared rays (also known as heat).