Given U-238s 4.5-billion-year half-life, the percentage of U-235 in natural uranium 2
Chapter 38, Problem 81(choose chapter or problem)
Given U-238s 4.5-billion-year half-life, the percentage of U-235 in natural uranium 2 billion years ago was a. about 1%. b. about 4%. c. about 10%. d. nearly 100%.
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