A radio telescope on a satellite detects radio waves from a distant galaxy. The radio waves travel through space, which is a vacuum.
| Quantity | Value |
|---|---|
| Wavelength of the radio waves | 0.50 m |
| Speed of electromagnetic waves in a vacuum | 3.0 × 108 m/s |
State the equation linking wave speed, frequency and wavelength.
Calculate the frequency of the radio waves.
The telescope also detects a second electromagnetic wave from the same galaxy. This wave travels through space at the same speed and has twice the frequency of the radio waves.
State how the wavelength of the second wave compares with the wavelength of the radio waves.
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.