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An artifact was found and tested for its carbon-14 content. If 88% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

  • math -

    you could use
    amount = initial(1/2)^(t/5730)
    .88 = 1(1/2)^(t/5730)
    t/5730ln.5 = ln .88
    t = 5730ln.88/ln.5 = 1056.75 yrs.

    or

    let amount = initial (e^(kt))
    when t = 5730 amount = .5
    .5 = e^(5730k)
    k = ln.5/5730 = -0.000120968

    .88 = e^(-.000120968t)
    t = ln.88/-.000120968
    = 1056.75

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