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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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rjlene rjlene
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11 years ago
he half life of 14C is 5730 years. What fraction of the 14C nuclei in a sample are left after 7660 years?

And

The amount of 14C in an old, isolated sample of vegetation is 0.679 that expected from a present day sample with an equivalent carbon content. Calculate the age of the old sample in years.
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#1
11 years ago
fraction remaining, f = 0.5^(t/h), where h is the half-life

a. f = 0.5^(7660/5730) = 0.3959 Leftwards Arrow-----

b. 0.679 = 0.5^(t/5730) , t = 5730*ln 0.679 / ln 0.5 = 3200 years Leftwards Arrow----
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