The half-life of a radioactive isotope `X` is `20` years. It decays to another
Channel: Doubtnut
Date: 2020-01-19

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 was estimated to be.