A safety officer checks four faulty pieces of equipment in a research laboratory. Each fault could let radiation escape towards a technician working nearby.
Which faulty item is most likely to harm the technician mainly by heating tissue below the skin?
the infrared heater with a missing guard
the microwave oven with a damaged door seal
the X-ray machine with a gap in its shielding
the ultraviolet lamp with a cracked cover
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.