A source that emits alpha particles is much more hazardous inside the body than outside the body.
Which statement explains this?
Outside, it is stopped by dead skin; inside, it is absorbed by living cells
Outside, it passes straight through the body; inside, it is fully absorbed
Outside, it is weakly ionising; inside, it changes into ionising gamma rays
Outside, it decays slowly; inside, its half-life becomes much shorter
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.