The speed of the electron in the Ist orbit of the hydrogen atom in the ground state is (c is the velocity of light):c 1/1.37 c/ 1370 c/ 13.7 c/ 137

Options

A. `(c )/(1.37)`
B. `(c )/(1370)`
C. `(c )/(13.7)`
D. `(c )/(137)`

Answer

D

Explanation

Velocity of electron in the first orbit, `v=h //(2 pi m r) =2, 189xx10^(8) cm//sec`.
Velocity of light, `c=3xx10^(10) cm//sec.` Ratio `c//v =137`