A homeowner uses a remote control to operate a smart speaker. Some remotes use infrared radiation to send signals, while others use radio waves.
Explain why a radio wave remote control can operate the smart speaker from another room through a closed wooden door, but an infrared remote control cannot.
26 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.