A) 20 years and 5 years respectively
B) 20 years and 10 years respectively
C) 10 years each
D) 5 years each
Correct Answer: A
Solution :
\[\frac{\frac{0.693}{\left( {{T}_{1/2}} \right){{ & }_{P}}}2N=10}{\frac{0.693}{{{\left( {{T}_{1/2}} \right)}_{Q}}}\,N=20}\,\Rightarrow \,\frac{{{T}_{Q}}}{{{T}_{P}}}=\frac{1}{4}\,\Rightarrow \,{{T}_{P}}=\,4{{T}_{Q}}\]
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