Half-Life
Authored by Science Staff
Physics
8th - 10th Grade
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Select the correction definition for half-life.
The time it takes for all of the radioactive nuclei to decay.
The time it takes for half of the radioactive nuclei to decay.
Half the time it takes for all of the radioactive nuclei to decay.
Half the time it takes for half of the radioactive nuclei to decay.
2.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
An alpha source in a smoke detector should have a _____ half-life.
3.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
The unit of activity is ____________.
4.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
A radioactive source has an activity of 800 Bq. It has a half-life of 4 hours. Calculate its activity after 24 hours.
5.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
A radioactive isotope has a half-life of 3 days. It's current activity 52 Bq. Calculate its activity 9 days ago.
6.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
The activity of a source is 680 Bq. After one full day its activity is has fallen to 85 Bq. Calculate its half-life.
7.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
The initial activity of a sample is 600 Bq. Calculate the percentage reduction in activity after 3 half-lives
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