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The half-life of 234U, uranium-234, is 2.52 105 yr. If 97.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

  • math -

    2.52*10^5 = 252 thousand
    do it all in thousands of years
    .5 = e^-k(252)
    ln .5 = -252 k
    solve for k
    then
    .974 = e^-kt
    ln .974 = - k t solve for t

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