A) \[4\times {{10}^{-11}}\]
B) \[2\times {{10}^{-11}}\]
C) \[16\times {{10}^{-11}}\]
D) \[8\times {{10}^{-10}}\]
Correct Answer: A
Solution :
\[t=\frac{\mu x}{c}=\frac{3\times 4\times {{10}^{-3}}}{3\times {{10}^{8}}}=4\times {{10}^{-11}}\]sec
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