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earth science

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if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days

  • earth science - ,

    x = Xi e^-kt

    1/2 = e^-24 k

    ln .5 = -24 k

    -.693 = -24 k
    k = .0289

    so
    x = 220 e^-.0289*168
    = 220 * .00779
    = 1.71 grams

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