A student writes four statements matching a communication system to the region of the electromagnetic spectrum that it uses to transmit signals.
Which statement is correct?
Bluetooth connections use ultraviolet wavelengths.
Satellite navigation (GPS) uses X-rays.
Optical fibre communication uses infrared wavelengths.
Local Wi-Fi networks use visible light.
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.