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November 27, 2014

November 27, 2014

Posted by **Owen** on Wednesday, December 5, 2012 at 4:21pm.

- Science -
**Elena**, Wednesday, December 5, 2012 at 4:33pmRadioactive decay law

N =N₀exp(-λt)=

=N₀exp(-ln2•t/T)=

=20exp(-0.693•18000/6000) = 2.5 g

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