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. Each one has a worked solution and a mark scheme showing where the marks go.