A) \[-\,13.6\,eV\]
B) \[-\,3.40\,eV\]
C) \[-\,1.51\,eV\]
D) \[-\,0.85\,eV\]
Correct Answer: B
Solution :
\[E=\frac{-13.6}{{{n}^{2}}}eV=\frac{-13.6}{{{2}^{2}}}=\frac{-13.6}{4}=-3.40\,\,eV\]
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