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indonguyen
 Post subject: please help me out !!!!!!
PostPosted: Sat, 26 Jul 2003 16:39:05 UTC 
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Over geological time, an atom of 238U decays to a stable 206Pb atom. A geochemist analyzes a rock and finds that is contains 9.0 x10-5 cm3 of helium (at standard temperature and pressure) per gram and 2.0 x 10-7 g of 238U per gram. Estimate the age of the rock in years given that the half-life of 238U is 4.47 x109 .
HINT: see decay series of 238U
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