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20 April, 13:59

An ancient club is found that contains 200 g of pure carbon and has an activity of 4.5 decays per second. Determine its age assuming that in living trees the ratio of atoms is about. Note that the half life of carbon-14 is 5700 years and the Avogadro number is

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  1. 20 April, 14:08
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    Explanation: initial activity = (0.693/Thalf) (N12C) (1.3*10^-12)

    (0.693/5700) (200 (1/12)) (6.023*10^23) (1.3*10^-12)

    = 1.22 * 10^9 decays/year.

    A = 4.5 decays/seconds
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