Q. Energy required for the electron excitation in $Li^{2 +}$from the first to the third Bohr orbit is

A) 36.3 $eV$
B) 108.8 $eV$
C) 122.4 $eV$
D) 12.1$eV$
Explanation

(b) $\mathrm{\Delta}E = 13.6Z^{2\ }\left( \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right)$
= 13.6 (3)$^{2}$$\left\lbrack \frac{1}{1^{2}} - \frac{1}{3^{2}} \right\rbrack$
=108.8 $e$V

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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