What is the term for the length of time required for half of the radioactive atoms in a sample to decay?
Unit 4: Geologic Time & Dating

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Science, Other Sciences
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9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Half-life
2.
FLASHCARD QUESTION
Front
Which of the following would NOT mark the boundary of a division of geologic time: time change, rock layer, or fossil evidence?
Back
Time change
3.
FLASHCARD QUESTION
Front
According to the law of superposition, how can you determine which layer is the youngest?
Back
The youngest layer is the one on top.
4.
FLASHCARD QUESTION
Front
What is the definition of half-life in the context of radioactive decay?
Back
The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope.
5.
FLASHCARD QUESTION
Front
If a rock sample has 12.5% of the original radioactive atoms remaining, how many half-lives have passed?
Back
3 half-lives.
6.
FLASHCARD QUESTION
Front
What principle states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom?
Back
The law of superposition.
7.
FLASHCARD QUESTION
Front
What is the significance of the half-life in radiometric dating?
Back
It allows scientists to determine the age of a sample based on the remaining radioactive isotopes.
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