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In a hydrogen atom,if energy of an electron in ground state is -13.6eV,then that in the $2^{nd}$ excited state is :


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$2^{nd}$ excited state means third energy level.
$\Rightarrow \large\frac{-13.6}{9}$
$\Rightarrow -1.51eV$
Hence (a) is the correct answer.
answered Jan 13, 2014 by sreemathi.v

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