Half-Life (AQA GCSE Physics): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the half-life of a radioactive isotope?
What is the half-life of a radioactive isotope?
Time for half the nuclei to decay
Can we predict exactly when a specific nucleus will decay?
Can we predict exactly when a specific nucleus will decay?
No, decay is completely random
If 80 atoms fall to 20 over 10 minutes, what is the half-life?
If 80 atoms fall to 20 over 10 minutes, what is the half-life?
5 minutes
What is a key characteristic of a short half-life source?
What is a key characteristic of a short half-life source?
Very radioactive, quickly dies down
What is the half-life of Americium?
What is the half-life of Americium?
432 years
What type of radiation does Americium emit in smoke alarms?
What type of radiation does Americium emit in smoke alarms?
Alpha particles
Why is Americium suitable for use in smoke alarms?
Why is Americium suitable for use in smoke alarms?
Won't need replenishing, weak activity
Which device measures radiation count rate?
Which device measures radiation count rate?
Geiger-Muller tube and counter
What does an activity of Bq represent?
What does an activity of Bq represent?
1 decay per second
Does the activity of a radioactive source ever reach zero?
Does the activity of a radioactive source ever reach zero?
No, it never reaches zero
If initial activity is 640 Bq, what % remains after 2 half-lives?
If initial activity is 640 Bq, what % remains after 2 half-lives?
25%
A source has half-life 15 days, initial count 200/s. Count after 45 days?
A source has half-life 15 days, initial count 200/s. Count after 45 days?
25 counts/s