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Radioactive Decay
Test Description: These questions relate to measuring geologic time and radioactive decay.
Instructions: Answer all questions to get your test result.
1) Which characteristic is most useful in correlating Devonian-age sedimentary bedrock in Virginia with Devonian-age sedimentary bedrock in other areas?
A
index fossils
B
rock types
C
particle size
D
color and texture
2) Which radioactive isotope has a half-life most useful for dating an object about 4700 years old?
A
potassium-40
B
rubidium-87
C
carbon-14
D
uranium-238
3) The half-life of a radioactive material can
A
increase if additional pressure is applied.
B
never be changed.
C
decrease if temperature is reduced.
D
be doubled.
4) Why is carbon-14 not used for dating rocks of Paleozoic age?
A
Half of the atomic nuclei of a given quantity of C-14 decays in about 57,000,000 years.
B
Paleozoic rocks are too young to date with C-14.
C
The decay rate of Carbon-14 is very slow.
D
The youngest Paleozoic rocks are more than 40 times the age that C-14 can date.
5) In order to date a rock sample 4 billion years old, a scientist would use
A
Beryllium-11
B
Carbon-10
C
Carbon-14
D
Uranium-238
6) If rocks on other continents contain fossil remains of large dinosaurs similar to U.S. fossils they are
A
similar in age to rocks in the U.S. containing these fossils.
B
much older than rocks in the U.S. containing these fossils.
C
younger than rocks in the U.S. containing these fossils.
D
younger than fossils from other continents.
7) Geologic time is generally subdivided and based on
A
crustal plate movements and mountain building.
B
geologic events.
C
biologic events; however, geologic events can contribute.
D
plate tectonics.
8) Some charcoal and charred bones of deer were analyzed for C-14. (half-life = 5730 yrs.) If 1/8 of the C-14 remained, then
A
the charcoal is 17,190 years old.
B
the charcoal is 5730 years old.
C
the charcoal is 22,920 years old.
D
the charcoal is 11,460 years old.
9) How is correlation of fossil species related to development of a Geologic Time Scale?
A
We can find exceptional fossil specimens on all continents.
B
Most places on Earth have a complete rock record.
C
Rocks and fossils are correlated from one continent to another.
D
Rocks and fossils are correlated only on one continent.
10) The relative ages of rocks is established using
A
sonar and radioactivity.
B
superposition, uniformitarianism and correlation of fossils.
C
sedimentation, erosion and volcanic activity.
D
topographic maps and landforms.
*select an answer for all questions
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