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Radioactive Dating
Test Description: Details the usefulness of radioactive elements, half-life controls and different types of radioactive materials.
Instructions: Answer all questions to get your test result.
1) Why are radioactive substances useful for measuring geologic time?
A
The ratio of decay products to undecayed products remains constant in sedimentary rocks.
B
Measurable samples of radioactive substances are easily collected from most rock specimens.
C
The disintegration of radioactive substances occurs at a predictable rate.
D
The half-lives of most radioactive substances are shorter than five minutes.
2) If a radioactive material were cut into pieces, the half-life of each piece would be
A
the same as the original specimen's half-life
B
none of the above
C
greater than the original specimen's half-life
D
less than the original specimen's half-life
3) If an object is cut in eight equal pieces, what happens to its half life?
A
the same
B
1/64 as long
C
8 times longer
D
1/8 as long
4) Why are radioactive materials useful for measuring geologic time?
A
The half-lives of most radioactive materials are less than five minutes.
B
Measurable samples of radioactive materials are easily collected from most rock types.
C
The ratio of decay products to undecayed material remains constant in sedimentary rocks.
D
The disintegration of radioactive materials occurs at a predictable rate.
5) Compared to the length of time for the first half-life of a sample of a radioactive isotope, the length of time for the second half-life is
A
greater
B
less
C
none of the above
D
the same
6) One similarity between uranium-238 and carbon-14 is that both
A
have the same half-life
B
decay at a predictable rate
C
are normally found in large quantities in living matter
D
are found in granite
7) The half-life of a radioactive substance is mainly controlled by the
A
pressure acting on the substance
B
composition of the substance
C
temperature of the substance
D
amount of the substance
8) Which radioactive isotope is most useful for determining the age of mastodont bones
A
rubidium-87
B
uranium-238
C
carbon-14
D
potassium-40
9) Which radioactive isotope disintegrates to lead (Pb206)?
A
U238
B
K40
C
C14
D
Rb87
10) Which two elements are most useful for the radioactive dating of recent organic remains?
A
U238 and Pb206
B
Rb87 and Sr87
C
K40 and Ca40
D
C14 and N14
*select an answer for all questions
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