JEE PHYSICS MCQ: NUCLEI

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A radioactive sample has

6.0 \times 10^{18}

active nuclei at a certain instant. How many of these nuclei will still be in the same active state after two half-lives?

View answer and explanation

Correct option: A

1.5 \times 10^{18}

Option A (

1.5 \times 10^{18}

) is correct because after two half-lives, the number of active nuclei is reduced to one-fourth of the original number.

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