A) 10 min
B) 15 min
C) 30 min
D) None of these
Correct Answer: B
Solution :
\[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[0.5=8{{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{5}{80}={{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{1}{16}={{\left( \frac{1}{2} \right)}^{n}}\] \[{{\left( \frac{1}{2} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{n}}\] \[n=4\] \[T=n\times {{t}_{1/2}}\]
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