A radioactive isotope X with a half–life of 1.37 × 10 9 years decays to Y which is…
Physics · JEE Advanced · NTA Exams — Atoms and Nuclei
A radioactive isotope X with a half–life of 1.37 × 109 years decays to Y which is stable. A sample of rock from the moon was found to contain both the elements X and Y which were in the ratio of 1 : 7 . The age of the rock is
- 1.96 × 108 years
- 3.85 × 109 years
- 4.11 × 109 years
- 9.59 × 109 years
Answer
(C) 4.11 × 10 9 years
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