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The ground state energy of hydrogen atom is $-13.6$ eV. The energy of second excited state of He$^+$ ion in eV is:
(1). ($-54.4$)
(2). ($-3.4$)
(3). ($-6.04$)
(4). ($-27.2$)
$E_3(\text{He}^+) = -13.6 \times \frac{4}{9} = -6.04$ eV.
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