A) \[1.5\times {{10}^{20}}\]
B) \[3\times {{10}^{20}}\]
C) \[6\times {{10}^{20}}\]
D) \[1\times {{10}^{19}}\]
Correct Answer: B
Solution :
Charge Q = I t = 1.6 ´ 60 = 96 C Let n be the number of \[C{{u}^{+2}}\] ions, then \[ne=Q\] Þ \[n=\frac{Q}{e}=\frac{96}{2\times 1.6\times {{10}^{-19}}}=3\times {{10}^{20}}\]
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