In hydrogen atom, if $V_n$ and $V_p$ are orbital velocities in $\mathrm{n}^{\text {th }}$ and…
In hydrogen atom, if $V_n$ and $V_p$ are orbital velocities in $\mathrm{n}^{\text {th }}$ and $\mathrm{p}^{\text {th }}$ orbit respectively, then the ratio $V_p: V_n$ is
$\mathrm{p}: \mathrm{n}$
$\mathrm{n}: \mathrm{p}$
$\mathrm{p}^2: \mathrm{n}^2$
$\mathrm{n}^2: \mathrm{p}^2$
Solution
Velocity of electron in $n^{\text {th }}$ orbit of hydrogen atom, $\mathrm{V}_{\mathrm{n}}=\frac{\mathrm{e}^2}{2 \varepsilon_0 \mathrm{hn}}$
$\begin{array}{ll}
\therefore & \mathrm{V}_{\mathrm{n}} \propto \frac{1}{\mathrm{n}} \\
\therefore & \frac{\mathrm{~V}_{\mathrm{p}}}{\mathrm{~V}_{\mathrm{n}}}=\frac{\mathrm{n}}{\mathrm{p}}
\end{array}$