Because scientists know how much carbon-14 a living

Chapter , Problem 1.2.27

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Because scientists know how much carbon-14 a living organism should have in its tissues, they can measure the amount of carbon-14 present in the tissue of a fossil and then calculate how long it took for the original amount to decay to the current level, thus determining the time of the organisms death. A tree fossil is found to contain 130 g of carbon-14, and scientists determine from the size of the tree that it would have contained 200 g of carbon-14 at the time of its death. Using Table 1.11 on page 12, approximately how long ago did the tree die?

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