A) 12 h
B) 24 h
C) 6 h
D) 130 h
Correct Answer: A
Solution :
For working safely, the activity must reduce to\[\frac{1}{64}.\] \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}=\frac{1}{64}\] \[\therefore \] \[n=6\] Thus,\[t=nT=6\times 2=12\,h\]
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