The Bohr's energy of a stationary state of hydrogen atom is given as $E_{n}=\frac{-2 \pi^{2} m e^{4}

Question

The Bohr's energy of a stationary state of hydrogen atom is given as $E_{n}=\frac{-2 \pi^{2} m e^{4}}{n^{2} h^{2}}$. Which of the following expression for value of $E_{n}$ is correct?\ A. $E_{n}=\frac{-21.8 	imes 10^{-19}}{n^{2}} \mathrm{Jatom}^{-1}$\ B. $E_{n}=\frac{-13.6}{n^{2}} \mathrm{eV}$ atom $^{-1}$\ C. $E_{n}=\frac{-1312}{n^{2}} \mathrm{~kJ} \mathrm{~mol}^{-1}$\ D. $E_{n}=\frac{-12.8 	imes 10^{-19}}{n^{2}} \mathrm{erg}$ atom $^{-1}$\

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(b)