Physics - Modern Physics Question with Solution | TestHub

Velocity of electron in $n^{\text{th }}$ orbit of hydrogen atom is given by : $$V_n=\frac{2\pi KZ{e}^2}{nh}$$ Substituting the values we get, $$V_n=\frac{2.2\times 10^6}{n}\mathrm{m}/\mathrm{s}\text{ or }{V}_n\propto \frac{1}{n}$$ As principal quantum number increases, velocity decreases.