A drone sends a radar pulse vertically downwards over a forest. Part of the pulse reflects from the top of the tree canopy and the rest reflects from the ground.
The radar pulse travels at 3.0 × 108 m/s. The echo from the tree canopy returns after 0.80 μs0.80\ \mu\text{s}0.80 μs. The echo from the ground returns after 1.0 μs1.0\ \mu\text{s}1.0 μs.
Calculate the height of the tree canopy above the ground.
112 exam-style questions on Edexcel GCSE Physics 4.1 Wave properties, covering 4.1.1 Waves transfer energy and information, 4.1.2 Frequency, wavelength, amplitude, period and wavefronts, 4.1.3 Longitudinal and transverse waves, 4.1.4 The wave speed equations, 4.1.5 Measuring wave velocity, and 4.1.6 Calculating depth or distance from waves. Each one has a worked solution and a mark scheme showing where the marks go.