What is the half-life of an isotope that decays to 25% of its original activity in 26.7 hours?
Md Ariful Islam
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Dr. Md Rushad Rahman
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Since the whole is 100%, the first half-life would drop to 50% and then to 25%. Because it takes the isotope 26.7 hours to reach 25%, and there are only 2 halves from 100 to 25%, divide 26.7/2, and you'll get 13.35 hours as the half life.
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