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Unformatted text preview: atoms was N U = N U + N Pb = 1 . 06 10 19 + 6 . 24 10 18 = 1 . 68 10 19 . (c) We use N U = N U e t where is the disintegration constant for the decay. It is related to the halflife T 1 / 2 by = (ln 2) /T 1 / 2 . Thus t = 1 ln N U N U = T 1 / 2 ln 2 ln N U N U = 4 . 47 10 9 y ln 2 ln 1 . 06 10 19 1 . 68 10 19 = 2 . 97 10 9 y ....
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 Fall '08
 SPRUNGER
 Physics, Mass

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