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In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is
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1.51 eV
1.51 eV
$2^{\text {nd }}$ excited state will be the 3 rd energy level
$$
\mathrm{E}_{\mathrm{n}}=\frac{13.6}{\mathrm{n}^2} \mathrm{eV} \text { or } \mathrm{E}=\frac{13.6}{9} \mathrm{eV}=1.51 \mathrm{eV}
$$
$$
\mathrm{E}_{\mathrm{n}}=\frac{13.6}{\mathrm{n}^2} \mathrm{eV} \text { or } \mathrm{E}=\frac{13.6}{9} \mathrm{eV}=1.51 \mathrm{eV}
$$
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