JEE PHYSICS MCQ: NUCLEI

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The activity of a radioactive sample decreases to one-third of the original value in 9 years. What will be the activity after further 9 years ?

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Correct option: C

\mathrm{A}_0 / 9

Option C (

\mathrm{A}_0 / 9

) is correct because after two half-lives (18 years), the activity will be reduced to one-ninth of the original value, given that it reduces to one-third in the first 9 years.

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