A) 17.5%
B) 15%
C) 12.5%
D) 10%
Correct Answer: C
Solution :
\[T=45\text{ }min,\text{ }{{\text{t}}_{-1/2}}=15\text{ }min\] \[\because \] \[T=n\times {{t}_{1/2}}\Rightarrow n=\frac{45}{15}=3\] \[\Rightarrow \] \[n=3\] \[N={{N}_{0}}\times {{\left( \frac{1}{2} \right)}^{3}}\]Let\[{{N}_{0}}=1\] \[N=1\times \frac{1}{8},N=\frac{1}{8}\] \[N=\frac{1}{8}\times 100=12.5%\] \[N=12.5%\]
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