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In a fossil sample, -decays of 14C nuclei occur at a rate of 5.0 decays per second. a) How many 14C nuclei are left in

In a fossil sample, -decays of 14C nuclei occur at a rate of 5.0 decays per second. a) How many 14C nuclei are left in the sample? b) If the sample is 20,000 years old, how many 14C nuclei were in the sample initially? c) How much energy have the decay reactions produced over the course of 20,000 years?

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