A radioactive isotope emits β\betaβ-particles.
The table below shows the activity of the isotope at different times:
| time / days | activity / counts per second |
|---|---|
| 0.0 | 800 |
| 10.0 | 200 |
| 20.0 |
What is the half-life of the isotope and what is the missing activity value at 20.0 days?
half-life =5.0 days= 5.0\text{ days}=5.0 days; activity =0 counts per second= 0\text{ counts per second}=0 counts per second
half-life =5.0 days= 5.0\text{ days}=5.0 days; activity =50 counts per second= 50\text{ counts per second}=50 counts per second
half-life =10.0 days= 10.0\text{ days}=10.0 days; activity =0 counts per second= 0\text{ counts per second}=0 counts per second
half-life =10.0 days= 10.0\text{ days}=10.0 days; activity =50 counts per second= 50\text{ counts per second}=50 counts per second
144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.