A) 700 days
B) 280 days
C) 560 days
D) 420 days
Correct Answer: C
Solution :
\[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/140}}\Rightarrow \frac{1}{16}={{\left( \frac{1}{2} \right)}^{t/140}}.\] \[\Rightarrow \frac{t}{140}=4\Rightarrow t=560\ days\]
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