Activity and half-life (FT)

This lesson explores the pattern behind the randomness of radioactive decay and how the half-life of an isotope can be determined from data.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is alpha radiation?

1/7

Q2.What is beta radiation?

2/7

Q3.How do we represent alpha radiation?

3/7

Q4.How do we represent beta radiation?

4/7

Q5.Uranium-238 decays, releasing alpha radiation. What will be the mass of the new atom formed? Uranium-238 has 92 protons and 146 neutrons.

5/7

Q6.Polonium-209 decays to form bismuth-209. What type of radiation has been released?

6/7

Q7.Polonium-209 decays to form Lead-205. What type of radiation has been released?

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is alpha radiation?

1/7

Q2.What is beta radiation?

2/7

Q3.How do we represent alpha radiation?

3/7

Q4.How do we represent beta radiation?

4/7

Q5.Uranium-238 decays, releasing alpha radiation. What will be the mass of the new atom formed? Uranium-238 has 92 protons and 146 neutrons.

5/7

Q6.Polonium-209 decays to form bismuth-209. What type of radiation has been released?

6/7

Q7.Polonium-209 decays to form Lead-205. What type of radiation has been released?

7/7

Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

  • Click "Close Video"
  • Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Activity and Half-life (FT)

Complete the quiz to see how much you have remembered.

Q1.What is the best definition of 'activity'?

1/7

Q2.Which word can be used to describe the process of radioactive decay?

2/7

Q3.What is the best definition of 'half life'?

3/7

Q4.What is the best definition of 'count rate'?

4/7

Q5.What is activity measured in?

5/7

Q6.The activity of a sample is measured over 550 seconds and show on the graph. What is the half-life of the sample?

6/7

Q7.If a radioactive sample contained 1600 billion nuclei and its half life was 57 years, after how many years would there be 400 billion nuclei remaining?

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Activity and Half-life (FT)

Complete the quiz to see how much you have remembered.

Q1.What is the best definition of 'activity'?

1/7

Q2.Which word can be used to describe the process of radioactive decay?

2/7

Q3.What is the best definition of 'half life'?

3/7

Q4.What is the best definition of 'count rate'?

4/7

Q5.What is activity measured in?

5/7

Q6.The activity of a sample is measured over 550 seconds and show on the graph. What is the half-life of the sample?

6/7

Q7.If a radioactive sample contained 1600 billion nuclei and its half life was 57 years, after how many years would there be 400 billion nuclei remaining?

7/7

Lesson summary: Activity and half-life (FT)

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Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance