A) \[9.1\,\min \]
B) \[6.1\,\min \]
C) \[2.3\,\min \]
D) \[1.1\,\min \]
Correct Answer: B
Solution :
[b] We know that the rate of integration \[\left| -\frac{dN}{dt} \right|=A\] \[\therefore \,\,\,\,\,\,\,\,\,A={{A}_{0}}{{e}^{-\lambda t}}\] or \[2700=4750\,{{e}^{-\lambda \times 5}}\] or \[\lambda =0.1131\] per minute Half-life minute
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