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ultraviolet |
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ultravioletAn invisible band of radiation at the upper end of the visible light spectrum. With wavelengths from 10 to 400 nm, ultraviolet starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet light is the sun. Although ultraviolet (UV) light is widely known as a disinfectant, it is also used to erase EPROM chips. After several minutes of exposure to UV light, the EPROM can be programmed again.
ultraviolet the part of the electromagnetic spectrum with wavelengths shorter than light but longer than X-rays; in the range 0.4 × 10--6 and 1 × 10--8 metres ultraviolet [¦əl·trə′vī·lət] (physics) Pertaining to ultraviolet radiation. Abbreviated UV. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| That's because clouds of hydrogen gas absorb far-ultraviolet light, and the most distant galaxies have the largest amount of hydrogen gas between them and Earth (SN: 2/24/96, p. Nonetheless, the image taken in far-ultraviolet wavelengths captured more than 400 stars and star-forming galaxies in the constellation Hercules, while the near-ultraviolet picture recorded more than 1,500 such objects. His team examined 60 clouds at far-ultraviolet wavelengths, which for the first time, revealed the clouds' hot, outer edges. |
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