Almost all of naturally occurring uranium is with a
Chapter 30, Problem 82(choose chapter or problem)
Almost all of naturally occurring uranium is \({ }_{92}^{238} \mathrm{U}\) with a half-life of \(4.468 \times 10^{9} \mathrm{yr}\). Most of the rest of natural uranium is \({ }_{92}^{235} \mathrm{U}\) with a half-life of \(7.04 \times 10^{8} \mathrm{yr}\). Today a sample contains 0.720 % \({ }_{92}^{235} \mathrm{U}\). (a) What was this percentage 1.0 billion years ago? (b) What percentage of uranium will be \({ }_{92}^{235} \mathrm{U}\) 100 million years from now?
Equation Transcription:
Text Transcription:
{ }_{92}^{238} U
4.468 x 10^9 yr
{ }_{92}^{235} U
7.04 x 10^8 yr
{ }_{92}^{235} U
{ }_{92}^{235} U
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