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Homework Help: Using differential equations to determine the decay constant for carbon-14

  1. Oct 8, 2008 #1
    1. The problem statement, all variables and given/known data
    Q(t) is the amount of carbon 14 at time t. Given half life of 5730 years, and assuming that Q satisfies dQ/dt=-rQ; determine decay constant r

    2. Relevant equations

    3. The attempt at a solution
    I solved the differential equation and got Q=ce^-rt. Now what? And hints/help?
  2. jcsd
  3. Oct 8, 2008 #2


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    Gold Member

    The half life is 5730 years, that means that Q(5730)=(1/2)Q(0)
  4. Oct 8, 2008 #3
    thanks i figured it out
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