A) \[8\times {{10}^{-5}}\]min
B) \[8.665\times {{10}^{3}}\]min
C) \[4\times {{10}^{-5}}\]min
D) \[1.25\times {{10}^{4}}\]min
Correct Answer: D
Solution :
\[8\times {{10}^{-5}}=\frac{1}{t}\left[ \frac{1}{0.5}-\frac{1}{1} \right]\] ; \[8\times {{10}^{-5}}=\frac{1}{t}[2-1]\] \[t=\frac{1}{8\times {{10}^{-5}}}=0.125\times {{10}^{5}}=1.25\times {{10}^{4}}min.\]
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