Why an electron "rotate" around the nucleus at a speed close to the light one? I mean where he gets all this energy? One DOES NOT simply approach the speed of light AFAIK.
closed as unclear what you're asking by Waffle's Crazy Peanut, Dilaton, Qmechanic♦ Jul 11 '13 at 12:32
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(1) if it were a classical system, the correct word is "revolve" rather than "rotate"; the Earth rotates every 24 hours and revolves around the sun (approximately) every 365 days
(2) since it's not a classical system, the notion of an electron revolving around the nucleus is suspect. Indeed, for S orbitals, the orbital angular momentum is zero.
So, where do you get this notion that your question is based on?