Half-Life (AQA GCSE Physics Combined Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What is the definition of half-life?
What is the definition of half-life?
Time for half the nuclei to decay
If atoms fall to over minutes, what is the half-life?
If atoms fall to over minutes, what is the half-life?
minutes
What is a characteristic of a source with a short half-life?
What is a characteristic of a source with a short half-life?
Very radioactive initially
What is the half-life of Americium?
What is the half-life of Americium?
years
Why is Americium used in smoke alarms?
Why is Americium used in smoke alarms?
Alpha is weakly penetrating
Why doesn't Americium need replacing in smoke alarms?
Why doesn't Americium need replacing in smoke alarms?
It has a long half-life
What does count rate measure?
What does count rate measure?
Radiation counts per second
What does Bq represent?
What does Bq represent?
decay per second
Initial activity is Bq. What % remains after half-lives?
Initial activity is Bq. What % remains after half-lives?
Half-life is days. What's count rate after days if initially counts/s?
Half-life is days. What's count rate after days if initially counts/s?
counts/s
What is true about radioactive decay?
What is true about radioactive decay?
It is a random process
What happens to the activity of a radioactive source over time?
What happens to the activity of a radioactive source over time?
Decreases but never reaches zero