Nuclei

Question: The activity of a sample is $64 \times 10^{–5}$ Ci. Its half-life is 3 days. The activity will become $5 \times 10^{–6}$ Ci after



1) 12 days
2) 7 days
3) 18 days
4) 21 days
Solution: Explanation: No Explanation
Radioactivity Modern Physics

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