An electromagnetic wave has a wavelength of 1.5 × 10-6 m in a vacuum. It then enters a transparent material where its speed is 2.0 × 108 m/s. The speed of electromagnetic waves in a vacuum is 3.0 × 108 m/s.
Calculate the wavelength of the wave in the material.
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.