A thickness sensor uses light with a frequency of 4.8 × 1014 Hz. The light travels through a transparent coating at 1.92 × 108 m/s.
To calibrate the sensor, an engineer needs to know the distance between neighbouring wave crests in the coating.
Calculate this distance.
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.