Half life

  • Thread starter abrowaqas
  • Start date
  • #1
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Homework Statement


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.


Homework Equations


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


The Attempt at a Solution



how i put the value of N... which is not clear in question
 

Answers and Replies

  • #2
212
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You have a differential equation, so you need to find your boundary conditions
 

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