
Unit 8 Flashcard Review
Flashcard
•
Physics
•
9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a half-life?
Back
The time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
How many half-lives have occurred if a sample has 8 parent isotopes and 24 daughter isotopes?
Back
2 half-lives.
3.
FLASHCARD QUESTION
Front
What is the product of radioactive decay called?
Back
Daughter element.
4.
FLASHCARD QUESTION
Front
What fusion process occurs early in a star's life?
Back
Hydrogen is converted into Helium.
5.
FLASHCARD QUESTION
Front
If a sample originally contained 100 grams of carbon-14 and now contains 12.5 grams, how many years ago was it part of a living tree?
Back
17,100 years.
6.
FLASHCARD QUESTION
Front
What did the Rosetta mission measure to help find out where Earth's water came from?
Back
The types of hydrogen in comet water.
7.
FLASHCARD QUESTION
Front
What is the significance of the daughter element in radioactive decay?
Back
It is the stable product formed after the parent isotope decays.
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