Some wireless doorbells use radio waves, whereas some home entertainment systems use infrared remote controls. Explain why a radio wave doorbell transmitter can signal the receiver through a solid brick wall, but an infrared remote control cannot operate a device if a solid brick wall is between them.
25 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.