An engineer checks the shielding around a machine that produces intense microwaves. A fault allows some of the radiation to reach the engineer's arm.
Which statement explains how the microwaves could harm tissue in the engineer's arm?
Their energy is absorbed by water molecules, heating tissue beneath the skin.
They pass through water-rich tissue, transferring most of their energy beyond the body.
They are absorbed more strongly by dense bone, concentrating heating in the bone.
They are absorbed mainly near the skin surface, concentrating heating there.
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.