A) \[30\times {{10}^{25}}\]
B) \[4\times {{10}^{22}}\]
C) \[10\times {{10}^{20}}\]
D) \[5\times {{10}^{15}}\]
Correct Answer: B
Solution :
\[P=\frac{nE}{t}\]\[\Rightarrow 300\times {{10}^{6}}\]\[=\frac{n\times 170\times {{10}^{6}}\times 1.6\times {{10}^{-19}}}{t}\] \ Number of atoms per sec \[\frac{n}{t}=1.102\times {{10}^{19}}\] Number of atoms per hour = 1.02 ´ 1019 ´ 3600 = 3.97 ´ 1022.
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