A) 256 yr
B) 128 yr
C) 64 yr
D) 24 yr
Correct Answer: D
Solution :
\[R={{R}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{R}{{{R}_{0}}}={{\left( \frac{1}{2} \right)}^{t/{{T}_{1/2}}}}\] \[\left( \frac{1}{8} \right)={{\left( \frac{1}{2} \right)}^{t/{{T}_{1/2}}}}\] \[{{\left( \frac{1}{2} \right)}^{3}}={{\left( \frac{1}{2} \right)}^{t/{{T}_{1/2}}}}\] \[\frac{t}{{{T}_{1/2}}}=3\] \[t=3{{T}_{1/2}}=3\times 8=24\,yr\]
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