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describe / state
Recall and explain
(a) Describe what happens when a narrow beam of white light passes through a glass prism. (b) State the seven colours of the visible spectrum in order of increasing frequency. (c) State the seven main regions of the electromagnetic spectrum in order of increasing wavelength. (d) Supplement. State what is meant by monochromatic light.
describe: give the features or what happens. state: give a concise answer.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
The dispersion of white light by a glass prism (3.2.4.1); the seven colours of the visible spectrum in order of frequency and of wavelength (3.2.4.2); Supplement: monochromatic light, of a single frequency (3.2.4.3); the main regions of the electromagnetic spectrum in order of frequency and of wavelength (3.3.1); all electromagnetic waves travelling at the same high speed in a vacuum (3.3.2); typical uses of each region (3.3.3) and the harmful effects of too much of some of them (3.3.4); Supplement: the speed of electromagnetic waves, 3.0 × 10⁸ m/s in a vacuum and approximately the same in air (3.3.6). Communication with electromagnetic waves (3.3.5 and 3.3.7–3.3.10) is in its own module; v = fλ is in Waves in a ripple tank; the wavelength of each region, the photon and how the eye sees colour are not covered here.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus