question_answer

The energy of an electron revolving in \[{{n}^{th}}\] Bohr's orbit of an atom is given by the expression   [MP PMT 1999]

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)                 \[{{E}_{n}}=-\frac{2\pi {{m}^{2}}{{e}^{2}}{{z}^{4}}}{{{n}^{2}}{{h}^{2}}}\]