A) 13.8 days
B) 16.5 days
C) 33 days
D) 76 days
Correct Answer: B
Solution :
By formula, \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/{{T}_{1/2}}}}\] \[{{\left( \frac{1}{2} \right)}^{n}}=\frac{N}{{{N}_{0}}}=\frac{1}{20}\]gives \[n=4.3\] \[t=nT=4.3\times 3.8\approx 16.5\]days
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