A) 25\[{{s}^{-1}}\]
B) 80\[{{s}^{-1}}\]
C) 625\[{{s}^{-1}}\]
D) 20\[{{s}^{-1}}\]
Correct Answer: B
Solution :
\[A={{A}_{0}}{{\left( \frac{1}{2} \right)}^{t/{{T}_{1/2}}}}\]Þ\[5={{A}_{0}}{{\left( \frac{1}{2} \right)}^{\frac{2\times 60}{30}}}=\frac{{{A}_{0}}}{16}\]Þ\[{{A}_{0}}=80\,se{{c}^{-1}}\]
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