CAIE IGCSE Physics 3.3.2 All Em Waves Travel At the Same High Questions

Practise using the common vacuum speed of all electromagnetic waves and distinguish it from sound speed while comparing travel times and wavelengths.

Exam points

State that all electromagnetic waves travel at 3.0 × 10⁸ m/s in a vacuum, explain their nearly common speed in air while frequency and wavelength differ, and contrast with sound or ultrasound whose speed depends on the medium.

[Maximum number: 1]

Some of the components of the electromagnetic spectrum, in order of decreasing wavelength, are shown.
radio waves
microwaves
visible light
ultraviolet radiation
gamma rays

State the speed at which all electromagnetic waves travel in a vacuum.

$3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$

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CAIE IGCSE Physics 3.3.2 All Em Waves Travel At the Same High Questions question 1