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

    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.

  2. 10 Αυγ 2016 · The Sun is a source of the full spectrum of ultraviolet radiation, which is commonly subdivided into UV-A, UV-B, and UV-C. These are the classifications most often used in Earth sciences. UV-C rays are the most harmful and are almost completely absorbed by our atmosphere.

  3. The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn-producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.

  4. Electromagnetic radiation of shorter wavelength than visible radiation but longer than x-rays. Radiation in the interval 10 to 4000 angstroms. UV radiation from the sun is responsible for many photochemical ractions in the upper atmosphere especially the formation of ozone. UV-B radiation in the range 280-320 nm can possibly have serious health ...

  5. 23 Σεπ 2024 · Ultraviolet (UV) radiation is undetectable by the human eye, although, when it falls on certain materials, it may cause them to fluoresce—i.e., emit electromagnetic radiation of lower energy, such as visible light. Many insects, however, are able to see ultraviolet radiation.

  6. 6 Φεβ 2008 · Ultraviolet Radiation. Electromagnetic radiation of shorter wavelength than visible radiation but longer than x-rays. Radiation in the interval 10 to 4000 angstroms. UV radiation from the sun is responsible for many photochemical ractions in the upper atmosphere especially the formation of ozone.

  7. www.nasa.gov › astrophysics › electromagnetic-spectrumUltraviolet Light - NASA

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