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JEE Main 2019 (9 Apr, Shift 2) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from JEE Main 2019 (9 Apr, Shift 2)

Q41JEE Main 2019 · 9 APR · SHIFT 2Medium

Energy of the Electron & Energy Levels

A He+ ion is in its first excited state. Its ionization energy is :-

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Answer: (a)

He $^+$ : $Z = 2$ , first excited state $n = 2$ .
$E_2 = -13.6 \times \frac{4}{4} = -13.6$ eV
Ionisation energy $= 13.6$ eV; the answer is (a).

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