The velocity of the electron in the first Bohr orbit as compared to that of light is about

Velocity of the electron in the 1st Bohr orbit

Velocity of the electron in the 1^(st) Bohr orbit

The velocity of electron in first orbit of H-atom as compared to the velocity of light is

Velocity of electron in the first orbit of H-atom as compared to that of velocity of light is approximately

(a)Show that the ratio of velocity of an electron in the first Bohr orbit to the speed of light c is a dimensionless number. (b) Compute the velocity of electrons in ground state, first excited state and second excited state in Bohr atom model.