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Bismuth-214 has a half life of about 20 minutes. Find the amount of Bismuth-214 left from a 30-gram sample after 1 hour

 Mar 15, 2021
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Each 20 minutes there is 1/2 as much    one hour is 3 half lives :

start 30      then    15     then    7.5     then   3.75  gm

 

30(1/2)3 = 3.75 gm

 Mar 15, 2021

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