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GCSE Physics · key term
A region containing no matter; electromagnetic waves can travel through it without a material medium.
Used by Edexcel and OCR
Specification 5.7 · Paper 1
A region containing no matter.
Revise: EM Waves PropertiesAlthough these names identify different parts of the electromagnetic spectrum, every member of the family has the two properties considered here: it is transverse and it travels at the same speed in a vacuum.
Specification P5.2a, P5.2f · Paper 2 (Foundation), Paper 4 (Higher)
Revise: EM waves propertiesThe rule applies to every part of the spectrum: a radio wave, a visible-light wave and a gamma ray all have this same speed in a vacuum. Their different frequencies and wavelengths do not give them different vacuum speeds.
A region containing no matter. Electromagnetic waves can travel through it, unlike mechanical waves such as sound.
The equal-speed rule applies in a vacuum. Do not claim that every electromagnetic wave travels at the same speed in every material.
Give the vacuum speed with its unit: .
When giving the common speed, specify that it applies in a vacuum (or through space): .
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