Homework Help: Chemistry

Posted by Dianne on Tuesday, November 16, 2010 at 7:41pm.

How many half lives will it take for a sample of a radioactive isotope containing 20000 radioactive nuclei to decay to 2000 radioactive nuclei

Chemistry - bobpursley, Tuesday, November 16, 2010 at 7:53pm
to 1/10?

1/10=e^-.692t

take the ln of each side
ln .1=-.692t
t= 3.327 halflives

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