A) 5 years
B) 10 years
C) 20 years
D) None of these
Correct Answer: C
Solution :
\[N={{N}_{0}}{{e}^{-t/{{T}_{1/2}}}}\Rightarrow \frac{1}{4}={{e}^{-t/10}}\] \[\Rightarrow {{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{{{e}^{t/10}}}\Rightarrow t=20\ years\]You need to login to perform this action.
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