A) 0.12
B) 0.26
C) 1.2
D) 0.37
Correct Answer: B
Solution :
Here \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}={{\left( \frac{1}{2} \right)}^{1/3}}\] where n = Number of half lives \[=\frac{1}{3}\] Þ \[\frac{N}{{{N}_{0}}}=\frac{1}{1.26}\] Þ \[\frac{{{N}_{U}}}{{{N}_{Pb}}+{{N}_{U}}}=\frac{1}{1.26}\] Þ \[{{N}_{Pb}}=0.26\,{{N}_{U}}\] Þ \[\frac{{{N}_{Pb}}}{{{N}_{U}}}=0.26\]
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