A) 20 day
B) 15 day
C) 10 day
D) 3-4 day
Correct Answer: B
Solution :
Using the relation \[A={{A}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] Here\[A=\left( 1-\frac{7}{8} \right){{A}_{0}}=\frac{1}{8}{{A}_{0}}\] So\[\frac{1}{8}{{A}_{0}}={{A}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[{{\left( \frac{1}{2} \right)}^{3}}={{\left( \frac{1}{2} \right)}^{n}}\] So, \[n=3\] Hence,\[t=3\times 5=15\,\,day\]
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