The enregy, radius and velocity of the electron in the hydrogen atom in the ground state are `-13.6 eV, 0.53 Å` and `2.188 xx 10^(8) cm s^(-1)` respectively.
The velocity of the electron in the third orbit of hydrogen atom will be

Options

A. `0.729 xx 10^(8) cm s^(-1)`
B. `6.564 xx 10^(8) cm s^(-1)`
C. `19.692 xx 10^(8) cm s^(-1)`
D. `0.243 xx 10^(8) cm s^(-1)`

Answer

A

Explanation

For hydrogen, `v_(n) = (2.188 xx 10^(8) cm s^(-1))/(n)`
`v_(3) = 0.729 xx 10^(8) cm s^(-1)`