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  1. 19 hours ago · Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

  2. en.wikipedia.org › wiki › UltravioletUltraviolet - Wikipedia

    19 hours ago · Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, 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.