PhysicsElementary modern physicsJAMB
80 g of a radioactive substance decays to 10 g in 15 days. Find its half-life.
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Answer: B. 5 days
80 → 40 → 20 → 10 is three half-lives in 15 days, so each is 5 days.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.