What proportion of 235 U was present in a rock formed 3,000 x 106 years ago, given that the present proportion of 235 U to 238 U is 140? [University of Liverpool]

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What proportion of 235 U was present in a rock formed 3,000 × 106 years ago,
given that the present proportion of 235 U to 238 U is 140?
[University of Liverpool]
Transcribed Image Text:What proportion of 235 U was present in a rock formed 3,000 × 106 years ago, given that the present proportion of 235 U to 238 U is 140? [University of Liverpool]
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