Lesson
Lesson-9.1.3- explain some of the uses of electromagnetic radiations, including: ??? radio waves: broadcasting and communications ??? microwaves: cooking and satellite transmissions ??? infrared: heaters and night vision equipment.
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Lesson- 9.1.2- know the order of the electromagnetic spectrum in terms of decreasing wavelength and increasing frequency, including the colours of the visible spectrum.PreviousLesson-9.1.4- explain some of the uses of electromagnetic radiations, including: ??? visible light: optical fibres and photography ??? ultraviolet: fluorescent lamps.Next