Half Life Review
Flashcard
•
Science
•
8th - 11th 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
If the half-life of an isotope is 25 years, how much of a 4.0 g sample remains after 100 years?
Back
0.25 g.
3.
FLASHCARD QUESTION
Front
What is the half-life of Polonium-218 if 0.0625 grams remains of a 2.00 gram original sample after 15 minutes?
Back
3 minutes.
4.
FLASHCARD QUESTION
Front
Actinium-226 has a half-life of 29 hours. How much of a 100 mg sample remains after 58 hours?
Back
25 mg.
5.
FLASHCARD QUESTION
Front
If the half-life of an element is 20 minutes, what % of the element remains after an hour?
Back
12.5%.
6.
FLASHCARD QUESTION
Front
Define half-life in the context of radioactive decay.
Back
Half-life is the time required for half of the radioactive nuclei in a sample to decay.
7.
FLASHCARD QUESTION
Front
How do you calculate the remaining amount of a substance after multiple half-lives?
Back
Use the formula: Remaining amount = Initial amount × (1/2)^(number of half-lives).
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