Radio signals from a space probe near Saturn take 75 minutes to reach Earth.
Radio signals from a lander on Mars take 15 minutes to reach Earth.
Calculate how many times further the Saturn probe is from Earth than the Mars lander.
State the property of electromagnetic waves that you used to make this calculation.
26 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.