A) $ 10^{19} $
B) $ 10^{20} $
C) $ 1.1\times 10^{19} $
D) $ 1.1\times 10^{2} $
Correct Answer: A
$ n=\frac{q}{e}=\frac{1.6}{1.6\times {{10}^{-19}}}=10^{19} $
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