24-4: Half Life Problems
Chapter 24

Dr. Robert Belford & Rebekah Reinhart




Question 1
How many grams of 235U are left after 300 years if a sample originally weighed 26 grams and had a half life of 7.0*108 years?
(A)  13 grams
(B)  26 grams
(C)  39 grams
(D)  NOTA
 
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Question 2
How many grams of 90Sr are left after 50 years if a sample originally weighed 125 grams and had a half life of 28.8 years?
(A)  37.5 grams
(B)  75 grams
(C)  125 grams
(D)  NOTA
 
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Question 3
How many grams of 232Tn are left after 2000 years if a sample originally weighed 677 grams and had a half life of 1.4*1010 years?
(A)  160 grams
(B)  336 grams
(C)  677 grams
(D)  NOTA
 
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Question 4
How many grams of 131I are left after 5.0 years if a sample originally weighed 18 grams and had a half life of 8.03 days?
(A)  0 grams
(B)  9 grams
(C)  18 grams
(D)  NOTA
 
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Question 5
How many grams of 137Cs are left after 1 year if a sample originally weighed 53 grams and had a half life of 30 years?
(A)  26 grams
(B)  44 grams
(C)  52 grams
(D)  NOTA
 
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