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April 21, 2014

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MATH104
the fraction after t years is (1/2)^(t/252000) so, solve for t in .975 = (1/2)^(t/252000) t = 9204 years
Tuesday, December 18, 2012 at 11:15pm by Steve

MATH104
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? yr
Tuesday, December 18, 2012 at 11:15pm by ABDALLA

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