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Today,uranium Contains 0.72%0.72 \% 235U235 _ { U } (Half-Life = 0

Question 155

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Today,uranium contains 0.72%0.72 \% 235U235 _ { U } (half-life = 0.70 billion years) and 99.28%99.28 \%  238U\ { 238_ U } (half-life = 4.5 billion years) .At a time 1.9 billion years ago,what was the fraction of 235U235_ { U } in uranium?


A) 3.53%
B) 4.72%
C) 4.90%
D) 6.76%

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