Some food is irradiated with gamma rays to kill bacteria. The food does not touch the radioactive source.
Which statement about the irradiated food is correct?
It is contaminated, so it must be stored until it stops being radioactive
It becomes radioactive, so it gives out gamma rays when it is eaten
It is contaminated, so it must be washed to remove the gamma rays
It does not become radioactive, so it is safe to eat after treatment
48 exam-style questions on OCR GCSE Physics 6.2 Uses and hazards, covering 6.2.1 Contamination and irradiation, 6.2.2 Half-life and radiation hazards, 6.2.3 Medical uses of nuclear radiation, 6.2.4 Nuclear fission and chain reactions, and 6.2.5 Nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.