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he half-life of 234U, uranium-234, is 2.52 multiplied by 105 yr. If 97.5% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

  • MATH104 -

    the fraction after t years is

    (1/2)^(t/252000) so, solve for t in

    .975 = (1/2)^(t/252000)
    t = 9204 years

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