Half-Life
Flashcard
•
Chemistry, Physics
•
8th - 9th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is Half-Life?
Back
The amount of time it takes for half the nuclei in a sample of the isotope to decay.
2.
FLASHCARD QUESTION
Front
What does a half-life of 3 days mean for an isotope?
Back
It means that after 3 days, half of the original amount of the isotope will have decayed.
3.
FLASHCARD QUESTION
Front
If a radioactive isotope has a half-life of 10 years, how much of a 20g sample will remain after 30 years?
Back
2.5g.
4.
FLASHCARD QUESTION
Front
How do you calculate the age of a rock sample based on its remaining radioactive element?
Back
If 25% of the radioactive element remains, it has gone through two half-lives.
5.
FLASHCARD QUESTION
Front
What is the half-life of copper-64?
Back
13 hours.
6.
FLASHCARD QUESTION
Front
If you start with 20g of copper-64, how much will remain after 26 hours?
Back
5g.
7.
FLASHCARD QUESTION
Front
What is the significance of half-life in radioactive decay?
Back
It helps determine how long it takes for a substance to reduce to half its original amount.
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