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Intro to Astronomy

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The half-life of carbon 14, which is commonly used to date organic materials, is 5700 years. What is the minimum age of sample in which less than 1% of the organic carbon 14 is left?

  • Intro to Astronomy -

    If 1% is left,
    (0.01) = (0.5)^N
    where N is the number of half-lives.

    N = 6.644
    minimum age = 37,900 years

    There will be less than 1% left if the sample is older than that, so that is a minimum age.

    There is not much about astronomy here

  • Intro to Astronomy -

    Find the age for a rock for which you determine that 68% of the original uranium-238 remains, while the other 32% has decayed into lead.

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