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In a given sample, two radioisotopes, A and B, are initially present in the ratio of 1:4.

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In a given sample, two radioisotopes, A and B, are initially present in the ratio of 1:4. The half lives of A and B are respectively 100 years and 50 years. Find the time after which the amounts of A and B become equal.

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We have N = N0e-λt
For radio isotopes A and B, we can write

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