A) 15min
B) 30 min
C) 45 min
D) 60 min
Correct Answer: B
Solution :
\[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{{{N}_{0}}}{16}={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \] \[{{\left( \frac{1}{2} \right)}^{4}}={{\left( \frac{1}{2} \right)}^{n}}\] \[(\therefore n=4)\] Half-life\[=\frac{Total\,time}{n}\] \[=\frac{2}{4}\] \[=0.5h\] \[=30\text{ }min\]
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