GCSE Physics: Waves and the EM Spectrum

Waves carry energy without carrying matter, and GCSE Physics tests both the mechanics of that statement and its most important instance: the electromagnetic spectrum. This quiz covers the whole waves unit as it appears on both papers' territory.

The classification questions establish the two wave families with their canonical examples: transverse waves like light and water ripples, longitudinal waves like sound — extended by a comparison question that pairs the transverse/longitudinal distinction with the medium question, since sound needs one and light does not. The descriptive quantities each get exercised: amplitude (with the Higher-flavoured fact that energy scales with its square), wavelength as crest-to-crest distance, and the reciprocal relationship between period and frequency, applied to a 0.02 s period giving 50 Hz.

The wave equation questions work all three arrangements with concrete values: frequency of a water wave from speed and wavelength, speed of a 250 Hz sound wave with a 1.36 m wavelength (340 m/s), and the wavelength of a 1.5 GHz electromagnetic wave at the speed of light — a standard-form calculation that merges maths skills into physics. Per the 2025–2027 equations sheet arrangement, the equation is applied, never recited.

The electromagnetic spectrum questions cover what the specification names explicitly: the frequency ordering from radio waves up to gamma rays, the characteristic uses of each band (microwaves for satellite links, infrared for thermal imaging, and the rest), the shared properties of all EM waves — transverse, medium-free, light-speed in vacuum — and the health dimension: ultraviolet, X-rays and gamma rays as the ionising, tissue-damaging end of the spectrum. Each explanation states the principle or ordering being applied.

• Classify waves as transverse or longitudinal with correct examples
• Use amplitude, wavelength, frequency and period, including the period-frequency reciprocal
• Apply the wave speed equation in all three arrangements, including standard form
• Order the electromagnetic spectrum and match bands to their uses
• Identify the ionising EM bands and their dangers

Topic scope follows the Waves section of the Department for Education's GCSE combined science and physics subject content: properties of transverse and longitudinal waves, the wave equation, and the electromagnetic spectrum — its order, uses and hazards. Reflects the 2025–2027 equations sheet arrangement.