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Unformatted text preview: ln N K N K + N Ar + N Ca = t ln 1 1 + 1 + 8 . 54 = ln 2 T 1 / 2 t which (with T 1 / 2 = 1 . 26 10 9 y) yields t = 4 . 3 10 9 y....
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 Fall '08
 SPRUNGER
 Physics

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