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JEE Main 2011 (AIEEE) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from JEE Main 2011 (AIEEE)

Q47JEE Main 2011 · AIEEEMedium

Energy of the Electron & Energy Levels

Energy required for the electron excitation in $\text{Li}^{++}$ from the first to the third Bohr orbit is:

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Answer: (b)

$\Delta E = 13.6\,Z^2\left(\frac{1}{1^2} - \frac{1}{3^2}\right)$ eV with $Z = 3$ .
$\Delta E = 13.6 \times 9 \times \frac{8}{9} = 108.8$ eV
So the answer is (b) $108.8$ eV.

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