Half life (Edexcel GCSE Physics): Quizzes
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10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is half-life?
What is half-life?
Time for half the unstable nuclei to decay
What happens to activity after one half-life passes?
What happens to activity after one half-life passes?
It reduces by half
What is the unit used to measure the activity of a radioactive substance?
What is the unit used to measure the activity of a radioactive substance?
Becquerels (Bq)
What does Bq represent?
What does Bq represent?
One decay per second
Why is radioactive decay described as a random process?
Why is radioactive decay described as a random process?
We can't predict when one atom decays
Thorium-243 has a half-life of days. What is the activity after days from cps?
Thorium-243 has a half-life of days. What is the activity after days from cps?
300 cps
Thorium-243 has a half-life of days. What is the activity after days from cps?
Thorium-243 has a half-life of days. What is the activity after days from cps?
150 cps
A half-life is minutes. How many half-lives occur in hours?
A half-life is minutes. How many half-lives occur in hours?
4 half-lives
A sample has nuclei with a -minute half-life. How many remain after hours?
A sample has nuclei with a -minute half-life. How many remain after hours?
2,500 nuclei
On a decay graph, nuclei drop from to in days. What is the half-life?
On a decay graph, nuclei drop from to in days. What is the half-life?
2 days