Answer 5_3_2

What is the half life of radon-226?  l = 1.36 × 10-11 s-1                                

 

Formula: N = N0e-lt

 

½ = e-1.36 ´ 10^-11 ´ t1/2  (P)

 

Loge ½ = -1.36 ´ 10-11 ´ t1/2 (P)

 

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

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

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