The energy of an electron revolving in the $n^{th}$ Bohr's orbit of an atom is given by the expression
- A$E_n = - \frac{2\pi^2 m^4 e^2 z^2}{n^2 h^2}$
- B$E_n = - \frac{2\pi^2 m e^2 z^2}{n^2 h^2}$
- C$E_n = - \frac{2\pi^2 m e^4 z^2}{n^2 h^2}$
- D$E_n = - \frac{2\pi m^2 e^2 z^4}{n^2 h^2}$
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