The half-life of a radioactive isotope ...

The half-life of a radioactive isotope X is 50 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of `1:15` in a sample of a given rock. The age of the rock was estimated to be

100 years

150 years

200 years

250 years

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The half-life of a radioactive isotope X is 50 yr. It decays to an other element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a give rock. The age of the rock was estimated to be

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