Radioactive Decay: Question Preview (ID: 2119)

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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) color and texture
c) particle size
d) rock types

Which radioactive isotope has a half-life most useful for dating an object about 4700 years old?
a) carbon-14
b) potassium-40
c) rubidium-87
d) uranium-238

The half-life of a radioactive material can
a) never be changed.
b) decrease if temperature is reduced.
c) increase if additional pressure is applied.
d) be doubled.

Why is carbon-14 not used for dating rocks of Paleozoic age?
a) The youngest Paleozoic rocks are more than 40 times the age that C-14 can date.
b) Paleozoic rocks are too young to date with C-14.
c) Half of the atomic nuclei of a given quantity of C-14 decays in about 57,000,000 years.
d) The decay rate of Carbon-14 is very slow.

In order to date a rock sample 4 billion years old, a scientist would use
a) Uranium-238
b) Beryllium-11
c) Carbon-10
d) Carbon-14

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) younger than fossils from other continents.
c) younger than rocks in the U.S. containing these fossils.
d) much older than rocks in the U.S. containing these fossils.

Geologic time is generally subdivided and based on
a) biologic events; however, geologic events can contribute.
b) crustal plate movements and mountain building.
c) plate tectonics.
d) geologic events.

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 22,920 years old.
c) the charcoal is 11,460 years old.
d) the charcoal is 5730 years old.

How is correlation of fossil species related to development of a Geologic Time Scale?
a) Rocks and fossils are correlated from one continent to another.
b) We can find exceptional fossil specimens on all continents.
c) Rocks and fossils are correlated only on one continent.
d) Most places on Earth have a complete rock record.

The relative ages of rocks is established using
a) superposition, uniformitarianism and correlation of fossils.
b) sonar and radioactivity.
c) topographic maps and landforms.
d) sedimentation, erosion and volcanic activity.

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