A) 6 hr
B) 12 hr
C) 42 hr
D) 128 hr
Correct Answer: B
Solution :
b.\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\]or \[\frac{1}{64}={{\left( \frac{1}{2} \right)}^{t/T}}\] or \[{{\left( \frac{1}{2} \right)}^{6}}={{\left( \frac{1}{2} \right)}^{t/T}}\]or \[\frac{t}{T}=6\] \[\therefore \]\[t=6T\]or \[t=6\times 2=12\,hr.\] Hence, the correction option is .You need to login to perform this action.
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