Question:
A radio isotope 'X' with a half life 1.4 × 109 years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1:7. The age of the rock is:
A radio isotope 'X' with a half life 1.4 × 109 years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1:7. The age of the rock is:
Updated On: Dec 16, 2025
- 3.92 × 109 years
- 4.20 × 109 years
- 8.40 × 109 years
- 1.96 × 109 years
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The Correct Option is B
Solution and Explanation
The correct option (B): 4.20 × 109 years
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