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

    Hace 20 horas · Germanium is a chemical element; it has symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon. It is a metalloid (more rarely considered a metal) in the carbon group that is chemically similar to its group neighbors silicon and tin. Like silicon, germanium naturally reacts and forms ...

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

    Hace 20 horas · 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.It is also produced by electric arcs, Cherenkov radiation, and specialized lights, such as mercury-vapor lamps, tanning ...