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Home  arrow Chapter 9  arrow Quizzes  arrow Quiz 5: Determining Ages of Events – Radioactive Dating

Quiz 5: Determining Ages of Events – Radioactive Dating

Choose the best possible answer to the following questions about Key Concept 5 "Determining ages of events – Radioactive dating."


This activity contains 9 questions.

Question 1.
Why is radiometric dating the most reliable method of dating the geologic past?

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End of Question 1

Question 2.
Match the type of radioactive decay with the appropriate description:

A matching question presents 3 answer choices and 3 items. The answer choices are lettered A through C. The items are numbered 2.1 through 2.3. Screen readers will read the answer choices first. Then each item will be presented along with a select menu for choosing an answer choice. Using the pull-down menus, match each item in the left column to the corresponding item in the right column.
A an electron combines with a proton and forms a neutron, leaving the mass number unchanged, but the atomic number decreases by 1
B an electron is given off from the nucleus, leaving the mass number unchanged, but the atomic number increases by 1
C two protons and two neutrons are emitted from the nucleus, reducing the mass and atomic numbers
End of Question 2

Question 3.
Why is carbon-14 dating more appropriate for dating “young” events (younger than about 20,000 years old), but not for dating very old events (like the birth of the planet 4.5 billion years ago)?

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Question 4.
According to radioactive decay theory, how many half-lives have elapsed with the ratio of parent to daughter isotopes is 0.40 (meaning there is 40% of the parent isotope remaining) if there was 100% parent isotope originally?

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Question 5.
When does the “geochronological clock” begin for a mineral or fossil when the mineral grows or when the organism dies?

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Question 6.
Assume a radioactive isotope with a half-life of 1 million years. Match the percent of "parent" material remaining indicated on the figure with the age of the material.

The letters A through D appear on an image associated with this question.

This question presents 4 items numbered 6.1 through 6.4. Each item is presented with a pulldown menu containing the letters A through D. For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
End of Question 6

Question 7.

Using uranium isotopes, what would be the calculated age of a mineral in a metamorphic rock if the half-life of uranium-238 is 4.5 billion years, and there has been just a half of 1 half-life elapsed? Assume that no daughter isotopes were present at the beginning, and that no gain or loss of parent or daughter has occurred.

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Question 8.
Why must a mineral not gain or lose any parent or daughter isotopes during its “life” in order to provide an accurate radiometric date?

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Question 9.
Which of the following are considered difficulties in assigning numerical ages to layers of sedimentary rock?

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