What is half-life?
Half-life

Flashcard
•
Chemistry
•
10th - 11th Grade
•
Hard
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16 questions
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1.
FLASHCARD QUESTION
Front
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
How do you calculate the remaining amount after n half-lives?
Back
Remaining amount = Initial amount × (1/2)^n, where n is the number of half-lives.
3.
FLASHCARD QUESTION
Front
If a substance has a half-life of 10 years, how much of a 100g sample remains after 20 years?
Back
25g remains after 20 years (2 half-lives).
4.
FLASHCARD QUESTION
Front
What fraction of a radioactive sample remains after 1 half-life?
Back
1/2 of the original sample remains.
5.
FLASHCARD QUESTION
Front
What fraction of a radioactive sample remains after 2 half-lives?
Back
1/4 of the original sample remains.
6.
FLASHCARD QUESTION
Front
What fraction of a radioactive sample remains after 3 half-lives?
Back
1/8 of the original sample remains.
7.
FLASHCARD QUESTION
Front
If 80g of a substance has a half-life of 4 days, how much will remain after 12 days?
Back
10g will remain after 12 days (3 half-lives).
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