A variable-frequency source produces electromagnetic waves, and a detector measures the frequency of the waves it receives. The frequency of the source is increased from the radio-wave range to the microwave range.
Which observation demonstrates that the electromagnetic spectrum is continuous?
The detector records waves travelling at progressively higher speeds as the frequency increases.
The detector records the same wavelength as the frequency increases between the two ranges.
The detector records every intermediate frequency, with no interval in which electromagnetic waves are absent.
The detector records only one frequency in the radio-wave range and one in the microwave range.
93 exam-style questions on AQA GCSE Physics 6.2 Electromagnetic waves, covering 6.2.1 Types of electromagnetic waves, 6.2.2 Properties of electromagnetic waves 1, 6.2.3 Properties of electromagnetic waves 2, 6.2.4 Uses and applications of electromagnetic waves, 6.2.5 Lenses, and 6.2.6 Visible light. Each one has a worked solution and a mark scheme showing where the marks go.