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68.The half life of a radioactive isotope x is 20 years.It decays to another element y which is stable.X and Y were found to be in the ratio 1:7 in a given sample of rock.The estimated age of the rock a)60 b)80 c)100 d)40 |
| Answer» 68.The half life of a radioactive isotope x is 20 years.It decays to another element y which is stable.X and Y were found to be in the ratio 1:7 in a given sample of rock.The estimated age of the rock a)60 b)80 c)100 d)40 | |