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OpenStudy (anonymous):

Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/16.0 of the original amount. How long ago was this plant alive?

OpenStudy (anonymous):

okay so with an unknown amount of C-14 you have 1/16th.. well lets think.. first half life means that u have 1/2 of the original value. another half life meansu have 1/4. another half life is 1/8 another one is 1/16. that was 4 half lives.. 4 times 5730 years and you get 2.29*10^4 yrs ago.

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