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Lesson: Calculating the Activity of a Radioactive Source

In this lesson, we will learn how to calculate the activity of a radioactive sample after a given amount of time using the sample's half-life.

Question Video: Understanding Activity and Half-Life

07:26

Worksheet: Calculating the Activity of a Radioactive Source • 12 Questions

Q1:

The initial activity of a sample of radioactive material is 1 200 Bq. What is the activity of the sample after 1 half-life has passed?

Q2:

The initial activity of a sample of radioactive material is 800 Bq. What is the activity of the sample after 3 half-lives have passed?

Q3:

The shorter the half-life of a radioactive isotope, the more the activity of a sample decreases. The longer the half-life of a radioactive isotope, the more the activity of the sample decreases.

Aquickly, slowly
Bslowly, quickly
Cquickly, quickly
Dslowly, slowly

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