Half Life Practice HLE
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
Hard
Wayground Content
FREE Resource
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15 questions
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1.
FLASHCARD QUESTION
Front
What is half-life?
Back
The amount of time when half of the material has decayed.
2.
FLASHCARD QUESTION
Front
What is the half-life of iodine-131?
Back
8 days.
3.
FLASHCARD QUESTION
Front
If you start with 100.0 g of Zn-71, how much is left after 3 half-lives?
Back
12.5 g.
4.
FLASHCARD QUESTION
Front
After the third half-life, what percentage of the sample is left?
Back
12.5%.
5.
FLASHCARD QUESTION
Front
If 10 mg of iodine-131 is given, how much is left after 16 days?
Back
2.5 mg.
6.
FLASHCARD QUESTION
Front
How do you calculate the remaining amount after n half-lives?
Back
Remaining amount = Initial amount × (1/2)^n.
7.
FLASHCARD QUESTION
Front
What happens to the amount of a radioactive substance over time?
Back
It decreases exponentially.
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