There are two radioactive substances \( A \) and \( B \). Decay constant of \( B \) is two times...

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There are two radioactive substances \( A \) and \( B \). Decay constant of \( B \) is two times of \( A \). Initially both have equal number of nuclei. After \( n \) half-lives of \( A \), rate of disintegration of both are equal. What is the value of \( n \) ?
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