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In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a0 is the radius of the ground state orbit, m is the mass, e is the charge on the electron and ε0 is the vacuum permittivity, the speed of the electron is
(a) 0                         (b) eε0a0m 
(c) e4πε0a0m         (d) 4πε0a0me

(c) mv2a0=14πε0e2a02v=e4πε0a0m

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