24-3: Half Life Problems
Chapter 24
Dr. Robert Belford & Rebekah Reinhart
Question 1
How many grams of
^{238}
U are left after 40.0 years if a sample originally weighed 150. grams and had a half life of 4.5*10
^{8}
years?
(A)
75 grams
(B)
90 grams
(C)
150 grams
(D)
NOTA
Hint
Your response
Not answered yet
Question 2
How many grams of
^{137}
Cs 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
Hint
Your response
Not answered yet
Question 3
How many grams of
^{14}
C 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
Hint
Your response
Not answered yet
Question 4
How many grams of
^{40}
K are left after 1000 years if a sample originally weighed 45 grams and had a half life of 1.3*10
^{9}
years?
(A)
23 grams
(B)
32 grams
(C)
45 grams
(D)
NOTA
Hint
Your response
Not answered yet
Question 5
How many grams of
^{131}
I 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
Hint
Your response
Not answered yet