A radioactive powder with a half-life of 30 years is spilled onto a laboratory bench. Why is this spill more hazardous than a spill of a powder with a half-life of 30 seconds?
The powder with the longer half-life gives out more radiation each second
The powder with the longer half-life gives out more strongly ionising radiation
The powder with the longer half-life will still be emitting radiation years later
The powder with the longer half-life is harder to detect with a radiation detector
40 exam-style questions on AQA GCSE Physics 4.3 Hazards and uses of radioactive emissions and of background radiation, covering 4.3.1 Background radiation, 4.3.2 Different half-lives of radioactive isotopes, and 4.3.3 Uses of nuclear radiation. Each one has a worked solution and a mark scheme showing where the marks go.