Physics · Nuclei
An element X with a half-life of 1.4 × 109 years decays to form another stable element Y. A sample is taken from a rock that contains both X and Y in the ratio 1:7. If at the time of formation of the rock, Y was not present in the sample, then the age of the rock in years is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 12.8 × 109
- 20.35 × 109
- 31.4 × 109
- 44.2 × 109✓
Correct answer
4.2 × 109
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