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The first 200 words of this essay...
Parts of the electromagnetic spectrum including radio waves, visible light and infra-red are used in communication. In 1896 Guiglielmo Marconi used electromagnetic waves to make a wireless telegraph system. This type of wireless technology is vital for communicating in places where wires would not be practical such as moving objects such as cars and planes.
Visible light is energy that can be detected by our eyes. White light is made up of all the colours of the spectrum. Light travels in a wave and is part of the electromagnetic spectrum. In a vacuum all these waves travel at the same speed which is at the speed of light.
Radio waves easily pass through clouds and fog and can be sent long distances through the atmosphere from the radio transmitter to the receiver.
Infra red and visible light have limited applications in 'free space' type systems as they have a very short wavelength compared with radio waves and easily absorbed and scattered by the atmosphere. Examples of communication using visible light include traffic lights and lighthouses. Examples of communication using infrared are laptops to printers and remote controls to television.
Infra-red and visible
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