Posted by **Anonymous** on Wednesday, July 20, 2011 at 9:51am.

The half-life of 234U, uranium-234, 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 -
**bobpursley**, Wednesday, July 20, 2011 at 10:55am
.977=e^(-.693T/thalf)

take the ln of each side, solve for T

- algebra -
**lance**, Friday, December 16, 2011 at 2:46pm
The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

- algebra -
**Anonymous**, Saturday, April 28, 2012 at 12:15pm
The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.2% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed

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