An agricultural drone is deployed to monitor soil moisture levels beneath a dense forest canopy. The drone's imaging system can utilize either near-infrared radiation or microwaves.
Explain why the microwave sensor is able to detect soil moisture through the thick canopy, whereas the near-infrared camera is unable to do so.
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.