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(i)An electron in an atom could revolve in certain stable orbits without the emission of radiant energy. <br> (ii) Electron revolves around the nucleus only in those orbits for which the angular momentum in some integral multiple of `h/(2pi)` where h=Planck.s constant . <br> `L=n.h/(2pi)`. <br> (iii)When an electron make a transition from one non- radiating orbit to another of lower energy a photon of energy is equal to the energy difference between the two states is emitted. i.e. `hv=E_i-E_f`.