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Enlist the postulates of Bohr's atom model. |
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Answer» Solution :Bohr.s atom is based on the following assumptions : `implies` The energies of electrons are quantised . `implies` The electron is revolving around the nucleus in a certain fixed CIRCULAR path called stationary ORBIT. `implies` Electron can revolve only in those orbits in which the angular momentum (mvr) of the electron MUST be equal to an integral multiple of `h//2pi`. i.e., `mvr = nh//2pi` Where `n = 1,2,3...` etc. `implies` As long as an electron revolves in the fixed stationary orbit, it doesn.t LOSE its energy. However, when an electron jumps from higher energy state `(E_2)` to a lower energy state `(E_1)` the excess energy is emitted as radiation. The frequency of the emitted radiation is `E_2 - E_1 = hv` and `v = ((E_2 - E_1))/(h)` `implies ` Conversely, when suitable energy is supplied to an electron, it will jump from lower energy orbit to a higher energy orbit. |
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