A) 5.02 days
B) 15.2 days
C) 7.6 days
D) 11.4 days
Correct Answer: C
Solution :
Decayed fraction \[=\frac{3}{4}\], so undecayed fraction \[=\frac{1}{4}\] Now \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow \frac{1}{4}={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow n=2\] Þ \[t=n\times {{T}_{1/2}}=2\times 3.8=7.6\ days\]
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