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Half life

  1. Jul 22, 2010 #1
    1. The problem statement, all variables and given/known data
    2.71g sample of radioactive KCl is decaying at a constant rate of 400Bq into the isotope 40K. which constitutes 1.17% of normal K. calculate the half life of this nuclide.

    2. Relevant equations
    we have dn/dt = n * lamda and t-1/2 = 0.693/lamda.

    3. The attempt at a solution

    how i put the value of N... which is not clear in question
  2. jcsd
  3. Jul 22, 2010 #2
    You have a differential equation, so you need to find your boundary conditions
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