An aircraft-monitoring radar sends a radio signal through air and a solid protective panel. The signal travels at 3.0 × 108 m/s in air and 2.4 × 108 m/s in the panel. Its frequency is 150 MHz and remains constant as it passes into the panel.
Calculate the percentage decrease in wavelength when the signal enters the panel.
84 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.