The half life of a radioactive isotope ' X ' is 20 years It decays to another element ' Y' which is stable

byAbhinay Narayan Singh -
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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 of 1: 7 in a sample of a given rock. The age of the rock is estimated to be

(a) 60 years 

(b) 80 years

(c) 100 years

(d) 40 years

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 of 1: 7 in a sample of a given rock. The age of the rock is estimated to be


Ans: (a) 60 years


Solution :

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 of 1: 7 in a sample of a the given rock. The age of the rock is estimated to be




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