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There are two radioactive substance A an...

There are two radioactive substance `A` and `B`. Decay consant of `B` is two times that of `A`. Initially, both have equal number of nuclei. After n half-lives of `A`, rates of disintegration of both are equal. The value of `n` is .

A

4

B

2

C

1

D

5

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The correct Answer is:
C
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