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On the basis of Bohr’s theory, derive an expression for the radius of the nth orbit of an electron…

Physics20223 marksDerivation
On the basis of Bohr’s theory, derive an expression for the radius of the nth orbit of an electron of hydrogen atom.

Given: Centripetal electrostatic force $\frac{m v^2}{r} = \frac{1}{4\pi\varepsilon_0} \frac{e^2}{r^2}$ and Bohr's quantization condition $m v r = \frac{n h}{2\pi}$

To show: $r_n = \frac{n^2 h^2 \varepsilon_0}{\pi m e^2}$

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Atoms

From ISC 2022 Specimen Physics Paper 1, question 10.