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The energy of electron in first orbit of He⁺ is (R_H = -871.6 x 10^-20 J). The energy of electron in the first orbit of H is:

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-871 x 10^-20 J

-435.8 x 10^-20 J

-217.9 x 10^-20 J

-108.9 x 10^-20 J

answer is C.

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Detailed Solution

$E_{1 {He}^{+}} = E_{1 H} \times Z^{2} \begin{array}{l} ∴ - 871 .6 \times 10^{- 20} = E_{1 H} \times 4 \\ ∴ E_{1 H} = - 217 .9 \times 10^{- 20} J \end{array}$

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