CAIE IGCSE Physics 3.3.7 Em Radiation a Mobile Questions
Practise choosing microwaves, radio waves, visible light or infrared for mobile, Bluetooth and fibre communication and justify each choice physically.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- Justify microwaves for mobile signals by wall penetration and short aerials, explain Bluetooth range through signal weakening, and choose visible or infrared for optical fibres because glass transmits them at high data rates.
CAIE IGCSE Physics 3.3.7 Em Radiation a Mobile Questions question 1
Fig. 7.1 shows some uses of electromagnetic radiation and different regions of the electromagnetic spectrum.
Fig. 7.1
A Bluetooth headset can be used to listen to music on a mobile (cell) phone without the need for wires to connect the headset to the phone.
Suggest why a Bluetooth headset only works well over short distances.
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