Posted by Anonymous on Saturday, January 28, 2012 at 3:11pm.
The halflife of 234U, uranium234, is 2.52 105 yr. If 97.7% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

algebra  Damon, Saturday, January 28, 2012 at 4:02pm
.5 = e^2.52*10^5 k
ln .5 = 2.52 * 10^5 k
k =2.75*10^6
ln .977 = 2.75*10^6 t
t = 8460 years
= 8,000 years

algebra  bobpursley, Saturday, January 28, 2012 at 4:04pm
.977=1e^(.693t/thalf)
take lne of each side.
ln.977=.692t/th
t= thalf*ln.977/.693
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