MATH104
posted by ABDALLA .
he halflife of 234U, uranium234, 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

MATH104 
Steve
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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