Question:
If an electron is moving in the $\mathrm{n}^{\text {th }}$ orbit of the hydrogen atom, then its
velocity $\left(\mathrm{v}_{\mathrm{n}}\right)$ for the $n^{\text {th }}$
orbit is given as:
Correct Option: , 2
Solution:
$(2)$
We know velocity of electron in $\mathrm{n}^{\text {th }}$ shell of
hydrogen atom is given by
$v=\frac{2 \pi k Z e^{2}}{n h}$
$\therefore \mathrm{v} \propto \frac{1}{\mathrm{n}}$