Define Ultra violet rays ?
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Ultraviolet is a form of electromagnetic radiation with wavelength from 10 nm to 400 nm, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.
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Ultraviolet (UV) radiation is a type of energy produced by the sun and some artificial sources, such as arc welders and solariums.The sun’s UV is the main cause of skin cancer. Too much UV exposure also causes sunburn, tanning, premature ageing and eye damage.
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