Wednesday, January 22, 2014

Science

Main features of radioactivity: [pic] [pic] [pic] Wave function & Probability meanness: [pic] [pic] Bohrs toughie: [pic] The Bohr get of the atom, showing an negatron quantum jumping to rotate state n = 1. In 1913 Niels Bohr proposed a new model of the atom that included quantized negatron vault of heavens. In Bohrs model, negatrons could bear out only certain orbits around the atomic nucleus. When an atom emitted (or absorbed) cleverness, the negatron did not move in a continuous escape of stairs from virtuoso orbit around the nucleus to another, as mogul be expected classically. Instead, the electron would jump at once from one orbit to another, giving off the emitted light in the miscellany of a photon. The possible energies of photons wedded off by apiece element were determined by the differences in cleverness amongst the orbits, and so the emission spectrum for each element would contain a number of lines. Bohr theorised that th e angular momentum, L, of an electron is quantised: [pic] where n is an integer and h is the Planck constant. Starting from this assumption, ampere-seconds law and the equations of circular motion show that an electron with n units of angular momentum will orbit a proton at a distance r given by [pic], where ke is the Coulomb constant, m is the mass of an electron, and e is the charge of an electron. For control this is write as [pic] where a0, called the Bohr radius, is equal to 0.0529 nm. The Bohr radius is the radius of the smallest allowed orbit. The energy of the electron thunder mug also be calculated, and is given by [pic]. An electron loses energy by jumping straight off from its original orbit to a tear down orbit; the extra energy is emitted in the form of a photon. Conversely, an electron that absorbs a photon gains energy, hence it jumps to an orbit that is farther from the nucleus. individually photon from luminesce nce atomic hydrogen is due to an electron c! ontemptible from a higher orbit, with radius rn, to a lower...If you want to subscribe to a full essay, order it on our website: OrderCustomPaper.com

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