Half-life
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
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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 is the half-life of uranium-232?
Back
70 years.
3.
FLASHCARD QUESTION
Front
If the half-life of an isotope is 10 seconds, how much of the original sample remains after 20 seconds?
Back
1/4 of the original sample.
4.
FLASHCARD QUESTION
Front
How many half-lives are in 100 years if the half-life of strontium-90 is 25 years?
Back
4 half-lives.
5.
FLASHCARD QUESTION
Front
What fraction of a radioactive substance remains after 3 half-lives?
Back
1/8 of the original amount.
6.
FLASHCARD QUESTION
Front
If you start with 8 g of a substance with a half-life of 5 years, how much will remain after 15 years?
Back
1 g.
7.
FLASHCARD QUESTION
Front
What is the formula to calculate the remaining amount of a substance after a certain number of half-lives?
Back
Remaining amount = Initial amount × (1/2)^(number of half-lives).
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