JEE PHYSICS MCQ: NUCLEI

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Application +4 | -1

Half-lives of two radioactive substances A and B are respectively

20 \mathrm{~min}

. and

40 \mathrm{~min}

. initially, the samples of

\mathrm{A}

and

\mathrm{B}

have equal number of nuclei. After

80 \mathrm{~min}

, the ratio of the remaining nuclei of

\mathrm{A}

and

B

View answer and explanation

Correct option: C

1: 4

Option C (

1: 4

) is correct because after 80 minutes, substance A has gone through 4 half-lives and substance B has gone through 2 half-lives, resulting in a ratio of 1/16 to 1/4, which simplifies to 1:4.

JEE PHYSICS MCQ: NUCLEI

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