Half-Life

Half-Life

8th - 10th Grade

10 Qs

quiz-placeholder

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Half-Life

Half-Life

Assessment

Quiz

Physics

8th - 10th Grade

Practice Problem

Hard

Created by

Science Staff

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10 questions

Show all answers

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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