Half-Life
Authored by Science Staff
Physics
8th - 10th Grade
Used 61+ times
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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 BLANKS QUESTION
30 sec • 1 pt
An alpha source in a smoke detector should have a (a) half-life.
3.
FILL IN THE BLANKS QUESTION
30 sec • 1 pt
The unit of activity is (a) .
4.
FILL IN THE BLANKS 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.
(a)
5.
FILL IN THE BLANKS 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.
(a)
6.
FILL IN THE BLANKS 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.
(a)
7.
FILL IN THE BLANKS QUESTION
2 mins • 1 pt
The initial activity of a sample is 600 Bq. Calculate the percentage reduction in activity after 3 half-lives
(a)
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