The half-life of a radioactive isotope X...

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

60 years

80 years

100 years

40 years

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AAKASH INSTITUTE ENGLISH-NUCLEI-ASSIGNMENT (SECTION-C)

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