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Carbon 14 (146C, mass of 14.003242u, half-life of 5730 years) can be used to date things...

Carbon 14 (146C, mass of 14.003242u, half-life of 5730 years) can be used to date things that were once living. When a particular tree fell, a chunk of that tree would have had an activity of 15 decays/minute. Now, that chunk of the tree has a total of 1x10-12 g of carbon 14 in it. How long ago did the tree fall? [3436.6 yrs]

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