SOLUTION:
The half-life of 234U, uranium-234, is 2.52 105 yr. If 97.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?
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The half-life of 234U, uranium-234, is 2.52 105 yr. If 97.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?
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Question 564703:
The half-life of 234U, uranium-234, is 2.52 105 yr. If 97.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?
You can put this solution on YOUR website! I'm not sure what you mean by 2.52 105 yr. But I happen to know the half-life is about 246,000 years. So we can find k=ln(1/2)/(-246,000) is about 2.8177E-6. Then we just plug in: 0.974=e^{-kt} and we get t=9,349.56. I suppose that makes 9,000 years if we round down [I personally wouldn't round down: you'll underestimate the time you have to wait before the radiation gets to you!].
