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Today,uranium Contains 0

Question 28

Multiple Choice

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%

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