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  3. 3 the half life of a radioactive isotope x is 20 y

3 The half life of a radioactive isotope X is 20 yr It decays to...

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3 The half life of a radioactive isotope X is 20 yr 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 be a 40 yr b 60 yr c 80 yr NEET 2013 d 100 yr

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