What is the frequency of revolution of electron present in 2nd Bohr's orbit of H-atom?

Frequency of revolution
$\begin{array}{l}=\frac{\text{ velocity in second orbit }\left({\mathrm{V}}_2\right)}{2{\mathrm{\pi r}}_2}\\ =\frac{1.082\times {10}^6{\mathrm{ms}}^{-1}}{2\times \mathrm{\pi }\times \left(2.12\times {10}^{-10}\right)\mathrm{m}}=8.2\times {10}^{14}{\mathrm{s}}^{-1}\end{array}$