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