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April 19, 2015

April 19, 2015

Posted by **Anonymous** on Wednesday, July 27, 2011 at 10:13am.

- algebra -
**drwls**, Wednesday, July 27, 2011 at 10:40am(1/2)^(T/2.52*10^5) = 0.988

T is the time, in years, since it was 100% U-234.

Solve for T. Use of logs is recommended.

T = 4390 years

That rounds off to 4000 years.

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