Food is treated with gamma radiation from a sealed source. No radioactive material contacts the food. Which pair of statements explains the treatment?
Radiation makes microorganisms radioactive; the food contains the source.
Radiation kills microorganisms; the food does not contain the source.
Radiation makes microorganisms inactive; the food gains radioactive nuclei.
Radiation kills microorganisms; the food continues emitting gamma rays.
97 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.