The frequency of revolution of the electron in Bohr's orbit varies with $n$, the principal quantum number as

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$\begin{aligned} & f=\frac{v}{2 \pi r}=\left(\frac{V_0}{n}ight)\left(\frac{1}{2 \pi r_0 n^2}ight) \ & f=\frac{V_0}{2 \pi r_0}=\left(\frac{1}{n^3}ight)=f_0\left(\frac{1}{n^3}ight)\end{aligned}$

The frequency of revolution of the electron in Bohr's orbit varies with $n$, the principal quantum number as

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