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Hace 21 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 ...
Hace 21 horas · Sir Isaac Newton FRS (25 December 1642 – 20 March 1726/27 [a]) was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author who was described in his time as a natural philosopher. [7] He was a key figure in the Scientific Revolution and the Enlightenment that followed.
Hace 21 horas · Technology portal. v. t. e. A carbon nanotube ( CNT) is a tube made of carbon with a diameter in the nanometre range ( nanoscale ). They are one of the allotropes of carbon . Single-walled carbon nanotubes ( SWCNTs) have diameters around 0.5–2.0 nanometres, about 100,000 times smaller than the width of a human hair.
Hace 21 horas · Germany, [e] officially the Federal Republic of Germany, [f] is a country in the western region of Central Europe. It is the second-most populous country in Europe after Russia [g] and the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 constituent states have a total population of over 84 million in ...
