JEE PHYSICS MCQ: NUCLEI

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A 280 days old radioactive substance shows an activity of 6000 dps, 140 days later it’s activity becomes 3000 dps. What was its initial activity.

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Correct option: B

24000 dps

Option B (24000 dps) is correct because the initial activity is calculated by using the half-life formula and the given activities at different times.

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