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 \[N=\left( 1-\frac{7}{8} \right){{N}_{0}}=\frac{1}{8}\,{{N}_{0}}\] \[So\,\,\frac{1}{8}\,{{N}_{0}}={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/T}}\] \[\Rightarrow \,\,{{\left( \frac{1}{2} \right)}^{3}}\,\,=\,{{\left( \frac{1}{2} \right)}^{t/5}}\,\,\,\,\,\,\,\,\,\,\,\,\Rightarrow \,\,\,\,t=15\,\,days\]
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