A) 100 days
B) 50 days
C) 33 days
D) 16 days
Correct Answer: C
Solution :
After three half-lives (i.e., 30 days) it remains \[{{\left( \frac{1}{2} \right)}^{3}}=\frac{1}{8},\]so it will remain \[\frac{1}{10}th\], approximately in 33 days.
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