Radiometric Dating

Flashcard
•
Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is radiometric dating?
Back
A method used to date materials by comparing the abundance of radioactive isotopes and their decay products.
2.
FLASHCARD QUESTION
Front
Why is radiometric dating possible?
Back
Because the rates of decay of radioactive isotopes are constant.
3.
FLASHCARD QUESTION
Front
What does radioactive decay measure?
Back
Absolute time.
4.
FLASHCARD QUESTION
Front
What are isotopes?
Back
Atoms of the same element that have different numbers of neutrons.
5.
FLASHCARD QUESTION
Front
How do carbon-12 and carbon-14 differ?
Back
They differ by the number of neutrons, not protons.
6.
FLASHCARD QUESTION
Front
What is a half-life?
Back
The time required for half of the radioactive atoms in a sample to decay.
7.
FLASHCARD QUESTION
Front
If a rock sample has 25% of its original radioactive atoms left, how many half-lives have passed?
Back
2 half-lives.
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