24-3: Half Life Problems
Chapter 24

Dr. Robert Belford & Rebekah Reinhart




Question 1
How many grams of 238U are left after 40.0 years if a sample originally weighed 150. grams and had a half life of 4.5*108 years?
(A)  75 grams
(B)  90 grams
(C)  150 grams
(D)  NOTA
 
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Question 2
How many grams of 137Cs are left after 28 years if a sample originally weighed 75grams and had a half life of 30 years?
(A)  22.5 grams
(B)  39.3 grams
(C)  53.1 grams
(D)  NOTA
 
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Question 3
How many grams of 14C are left after 150 years if a sample originally weighed 16 grams and had a half life of 5715 years?
(A)  15.7 grams
(B)  37.8 grams
(C)  73.6 grams
(D)  NOTA
 
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Question 4
How many grams of 40K are left after 1000 years if a sample originally weighed 45 grams and had a half life of 1.3*109 years?
(A)  23 grams
(B)  32 grams
(C)  45 grams
(D)  NOTA
 
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Question 5
How many grams of 131I are left after 15 years if a sample originally weighed 25 grams and had a half life of 8.03 days?
(A)  0 grams
(B)  5 grams
(C)  13 grams
(D)  NOTA
 
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