Answer to Question 2

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Formula: N = N0e-lt

 

= e-1.36 10^-11 t1/2  

 

Loge = -1.36 10-11 t1/2  

 

t1/2 = -0.693 -1.36 10-11 = 5.1 1011 s (= 1600 years)

 

 

(Note: 10^11 means 1011.  I cannot do a double superscript.)