Today, uranium contains 0.72% ²³⁵U (half-life = 0.70 billion years) and 99.28% ²³⁸U (half-life = 4.5 billion years). At a time 1.9 billion years ago, what was the fraction of ²³⁵U in uranium? A) 3.53% B) 4.72% C) 4.90% D) 6.75%

Name: Today, uranium contains 0.72% 235 U (half-life = 0.70 billion years) and 99.28% 238 U (half-life = 4.5 billion years). At a time 1.9 billion years ago, what was the fraction of 235 U in uranium? A) 3.53% B) 4.72% C) 4.90% D) 6.75%
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The Answer is A

Today, Uranium Contains 0