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Homework Help: Can't figure this radioactive thing out

  1. Feb 11, 2012 #1
    I can't figure this out , i've tried and tried but I was absent the day they explained this and I have no idea at all what decays/min is or any of that. I've solved 9 problems and I'm missing 4, and one of them is similar to this one that I will try to answer once you try explain this one to me.

    Thank you very much!
    1. The problem statement, all variables and given/known data
    A 13.4756 g sample of petrified wood was found in a petrified forest. The sample showed a
    C-14 activity of 11 decays/min.
    How long has the tree been dead? The halflife of carbon-14 is 5730 years and freshly cut
    wood contains 6.5 × 10^10 atoms/g of C-14 and there are 365.25 days in a year.
    Answer in units of years.

    2. Relevant equations
    N=N0ek*t i think it's this? But I have no idea on how to use this

    3. The attempt at a solution
    I would try if I knew where to start lol
  2. jcsd
  3. Feb 13, 2012 #2


    User Avatar

    Staff: Mentor

    What is N0? What is N? Do you see them in the question?
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