A) \[{{(14)}^{3}}s\]
B) 28 s
C) 42 s
D) \[{{(14)}^{2}}\text{ }s\]
Correct Answer: C
Solution :
\[N={{N}_{0}}\times {{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{1}{8}{{N}_{0}}={{N}_{0}}\times {{\left( \frac{1}{2} \right)}^{n}}\] \[n=3\] \[T=n\times {{t}_{1/2}}\] \[=3\times 14=42\,s\]
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