Chemistry
posted by Shay .
Carbon14 has a halflife of 5730 years In a plant fossil you find that the 14 C has decayed to 1/8 of the original amount how long ago was this plant

1/8=e^.693t/5630
4730 ln(1/8)=.693t
solve for t
another way:
1/8=(1/2)^t
t=3 halflives
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