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The half life of a radioactive isotope 'X' is 20 years. It decays to another...

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The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio 1:7 in a sample of a given rock. The age of the rock is estimated to beA 40 yearsB 60 yearsC 80 yearsD 100 years

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