Answer to Question 4

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(a) The activity is 334 s-1 0.1 = 3340 s-1  

 

 

(b) DN/Dt = -lN

 

     -3340 s-1 = -l 1.5 109 = 2.23 10-6 s-1  

 

 

(c) N = N0 e-lt

 

     = e-2.23 10^-6 t

 

     loge = -2.23 10-6 s-1 t

 

     t = -0.693 -2.23 10-6 s-1 = 3.1 105 s

 

     t = 3.6 days