Link to our latest notes and resources: https://drive.google.com/drive/u/2/folders/15Ld6KabsL9x9X-t4GefBgSzXFDckJFa6 3.3 Electromagnetic spectrum 1 Know the main regions of the electromagnetic spectrum in order of frequency and in order of wavelength 2 Know that the speed of all electromagnetic waves in: (a) a vacuum is 3.0 × 108m/s (b) air is approximately the same as in a vacuum 3 Describe the role of the following components in the stated applications: (a) radio waves – radio and television communications, astronomy (b) microwaves – satellite television, mobile (cell) phone, Bluetooth, microwave ovens (c) infrared – household electrical appliances, remote controllers, intruder alarms, thermal imaging, optical fibres (d) visible light – photography, vision (e) ultraviolet – security marking, detecting counterfeit bank notes, sterilising water (f) X-rays – hospital use in medical imaging, security scanners, killing cancerous cells, engineering applications such as detecting cracks i

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