The human eye can detect electromagnetic radiation with frequencies from 4.0 × 1014 Hz to 7.5 × 1014 Hz.
The speed of electromagnetic waves in air is 3.0 × 108 m/s.
Calculate the range of wavelengths that the human eye can detect.
A television remote control emits radiation with a wavelength of 9.4 × 10-7 m.
Explain whether a person can see this radiation. Give the name of this type of radiation.
The camera on a mobile phone shows a flashing light when the remote control is pointed at it.
Suggest what this shows about the detector in the camera.
The electromagnetic spectrum includes waves with wavelengths from more than 1000 m to less than 1 × 10-12 m.
Explain why visible light is described as a very small part of the electromagnetic spectrum.
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.