What is a half-life?
Unit 4 Checkpoint E/F

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Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
If a rock sample is 25% radioactive, how many half-lives has it gone through?
Back
2 half-lives.
3.
FLASHCARD QUESTION
Front
True or False: A rock sample can eventually have 0% radioactive material.
Back
FALSE. Radioactive decay never reaches 0%.
4.
FLASHCARD QUESTION
Front
What is radiometric dating used for?
Back
To measure the absolute age of rocks and fossils.
5.
FLASHCARD QUESTION
Front
What is the original element that undergoes radioactive decay called?
Back
Parent isotope.
6.
FLASHCARD QUESTION
Front
What is a daughter isotope?
Back
The product of the decay of a parent isotope.
7.
FLASHCARD QUESTION
Front
How do you calculate the remaining amount of a radioactive substance after a certain number of half-lives?
Back
Use the formula: Remaining amount = Initial amount × (1/2)^(number of half-lives).
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