A) 3.4 days
B) 10 days
C) 15 days
D) 20 days
Correct Answer: C
Solution :
By using\[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/T}};\] where \[N=\left( 1-\frac{7}{8} \right)\,{{N}_{0}}=\frac{1}{8}{{N}_{0}}\] So\[\frac{1}{8}{{N}_{0}}={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/T}}\]Þ\[{{\left( \frac{1}{2} \right)}^{3}}={{\left( \frac{1}{2} \right)}^{t/5}}\]Þ t =15 days.
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