Q. The energy of an electron in $n$th orbit of hydrogen atom is $- 13.6/n^{2}eV$. Energy required to excite the electron from the first orbit to the third orbit is

A) 10.2 J
B) 12.09 J
C) 12.09 eV
D) 13.6 eV
Explanation

(c) $E = E_{3} - E_{1} = - \frac{13.6}{3^{2}}—\left( - \frac{13.6}{1^{2}} \right)$
$E = - 1.51 + 13.6 = 12.09\ eV$

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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