A) 60 days
B) 30 days
C) 40 days
D) 240 days
Correct Answer: B
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow \left( \frac{1}{16} \right)={{\left( \frac{1}{2} \right)}^{n}}\Rightarrow n=4\] also \[n=\frac{t}{{{T}_{1/2}}}\Rightarrow {{T}_{1/2}}=\frac{120}{4}=30\ days\]
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