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NEET 1988 (AIPMT) · Law of Radioactive Decay

Law of Radioactive Decay question from NEET 1988 (AIPMT)

Q126NEET 1988 · AIPMTEasy

Law of Radioactive Decay

A radioactive sample with a half life of 1 month has the label: 'Activity = 2 micro curies on 1 - 8 - 1991'. What would be its activity two months earlier?

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Answer: (d)

Two months earlier is 2 half-lives before the label date.
Activity then $= 2 \times 2^2 = 8$ micro curie.
So the answer is (d) 8 micro curie.

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