Question

The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is
(a) $\frac{e^2}{2\epsilon_0hc}$
(b) $\frac{2 e^2 \epsilon_0}{hc}$
(c) $\frac{e^3}{2 \epsilon_0 hc}$
(d) $\frac{2 \epsilon_0 hc}{e^2}$

Answer 1

And is d
Well I am not sure but is should be d)