Answer :
Final answer:
The half-life of francium-223 is approximately 21.8 minutes.
Explanation:
The decay of radioactive substances follows an exponential decay model. The time it takes for a sample to decay by 50% is determined by its half-life. The half-life of francium-223 is approximately 21.8 minutes. So, it would take approximately 21.8 minutes for a sample of francium-223 to decay by 50%.
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