Half-Life
Flashcard
•
Chemistry, Physics
•
8th - 9th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is half-life?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
What is the half-life of iodine-131?
Back
8 days.
3.
FLASHCARD QUESTION
Front
If you start with 200 grams of a radioactive isotope with a half-life of 10 years, how much will remain after 30 years?
Back
50 grams.
4.
FLASHCARD QUESTION
Front
If you have 80 grams of a radioactive isotope with a half-life of 5 years, how much will remain after 15 years?
Back
10 grams.
5.
FLASHCARD QUESTION
Front
What is the half-life of an isotope that decays to 25% of its original amount in 20 years?
Back
10 years.
6.
FLASHCARD QUESTION
Front
If 10 mg of iodine-131 is given to a patient, how much is left after 24 days?
Back
1.25 mg.
7.
FLASHCARD QUESTION
Front
How many half-lives are in 40 years if the half-life is 10 years?
Back
4 half-lives.
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