A) 40 days
B) 20 days
C) 1.25 days
D) 30 days
Correct Answer: D
Solution :
\[\frac{1}{8}=\frac{1}{{{2}^{n}}}\] \[\left( \because \,\,\frac{N}{{{N}_{0}}}=\frac{1}{{{2}^{n}}} \right)\] \[n=3\] \[t=10\times 3=30\] days.
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