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 `epsilon_0` is the vacuum permittivity, the speed of the electron is

Options

A. 0
B. `\frac { e } { \sqrt { epsilon_0a_0m } }`
C. `\frac { e } { \sqrt { 4piepsilon_0a_0m } }`
D. `\frac { \sqrt { 4 \pi epsilon_0 a_0 m } } { e }`

Answer

C