Contents
Part 1 of 2
Signals around the world
identify
Try it yourself
A ground station in Scotland sends a television signal up to a satellite. The sky is covered in heavy grey cloud, and the station’s dish aims all of the signal at that one satellite, far above. Which kind of wave does the ground station mainly use?
identify: name or select.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Communication with artificial satellites, mainly by microwaves: low-orbit satellites for some satellite phones, geostationary satellites for other satellite phones and for direct broadcast satellite television (3.3.5); Supplement: why mobile phones and wireless internet use microwaves, Bluetooth radio waves, and optical fibres visible light or infrared (3.3.7); digital and analogue signals (3.3.8); a sound sent as a digital or analogue signal (3.3.9); the benefits of digital signals, a higher rate of data and a greater range through accurate regeneration (3.3.10). The regions of the electromagnetic spectrum and their other uses are in Light and the electromagnetic spectrum; total internal reflection in optical fibres is in Refraction; orbits and their periods are in the Space physics modules; how a signal is put onto a carrier wave and how a sound is sampled are not covered.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus