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Fixxxer125
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Homework Statement
The equilibrium concentration of C14/C12 ≈ 1.5×10−12
A 2.5 g sample of Carbon from an old tree fragment has an activity of 4.57 decays per minute. How old is the sample?
Homework Equations
I'm pretty sure I use A(t)=λN(0)*exp(-tλ)
but I am having trouble calculating N(0)! The amount of C14 c.f. C12 is so tiny I don't know how to manipulate the ratio to get the mass of C14, and thus the number of nucli, in the sample. Thanks!