Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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| 1. | According to the graph below, what is the half-life of the radioactive nuclide
strontium-90?
a. | 10
years | c. | 50
years | b. | 25 years | d. | 100 years | | | | |
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| 2. | The
half-life of element X is 10.0 days. If you start with a 128 gram sample of element X, what
mass of element X remains after a period of 50.0 days? a. | 4.00
g | c. | 2.56
g | b. | 12.8
g | d. | 25.6
g | | | | |
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| 3. | The
half-life of carbon-14 is 5730 years. What fraction of a carbon-14 sample would exist after
22920 years?
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| 4. | A
sample of the radioactive isotope radon-222 has an initial mass of 10.0 grams. After 15 days,
approximately 0.63 grams of radon-222 remains. What is the half-life of
radon-222? a. | 10
days | c. | 3.8
days | b. | 5
days | d. | 7.5
days | | | | |
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| 5. | A
piece of wood found in an ancient burial mound contains only half as much carbon-14 as a piece of
wood cut from a living tree growing nearby. If the half-life (T1/2)for carbon is
5730 years, what is the approximate age of the ancient wood? a. | 1432.5
years | c. | 5730
years | b. | 2856 years | d. | 1460 years | | | | |
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| 6. | The
decay rate of an ancient wood carving is one-fourth that of the decay rate of carbon-14 in living
tissue. (The half-life of carbon-14 is 5730 years.) How old is the
carving? a. | 1432
years | c. | 11460
years | b. | 5730 years | d. | 17190 years | | | | |
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