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the half life of strontium 90 is approximately 28 years. find the amount of strontium-90 left from a 10 gram sample after 56 years

 Apr 22, 2020
 #1
avatar+23526 
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.5 = 1 e^-k 28

k =.0247553

 

 

? = 10 e^-.0247553 (56)

 

? = 2.5 gm   

 Apr 22, 2020
 #2
avatar+23526 
+1

After 28 years there will 1/2  of  10gm left =   5 gm

    after ANOTHER 28 YEARS there will be 1/2  of 5 gm left =  2.5 gm

 Apr 22, 2020

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