The electromagnetic spectrum is described as continuous.
What does this mean?
All parts of the spectrum have equal ranges of frequency.
All parts of the spectrum are detected by the human eye.
There are no gaps between the wavelength ranges of its groups.
There are no differences between the frequencies of its groups.
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.