In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If {{a}_{0}} is the radius of the ground state orbit, m is the mass, e is the charge on the electron and {{varepsilon }_{0}} is the vacuum permittivity, then speed of the electron is a) sqrt{frac{{{varepsilon }_{0}}{{a}_{0}}m}{e}} b) frac{e}{sqrt{{{varepsilon }_{0}}{{a}_{0}}m}} c) frac{sqrt{4pi {{varepsilon }_{0}}{{a}_{0}}m}}{e} d) frac{e}{sqrt{4pi {{varepsilon }_{0}}{{a}_{0}}m}}
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