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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 nuceli. After n half-lives of `A`,rates of disintegaration of both are equal. The value of `n` is .

A

1

B

2

C

4

D

None of these

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A
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