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Electromagnetic radiation are electric disturbances
-they travel as waves and move energy from place to place
The higher the frequency of an electromagnetic wave, the more energy it transfers. Different wavelengths of the spectrum are reflected, absorbed or transmitted differently
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Gamma X-rays Ultraviolet Visible light Infrared Microwaves Radio
visible light is detected by our eyes see different wavelengths as different colours. The wavelength increases from violet to red. Can be used for photography
Microwaves are used for communication. Microwave transmitters produce wavelengths that are able to pass through the atmosphere. They send signals to and from satellites and withing mobile phone networks
The radio and microwave spectrum is divided into different bands; which are used for different communication purposes
Mobiles communicate with a local mobile phone mast using wavelengths as microwaves/radio waves
Optical fibres are very thin glass fibres. We use them to transmit signals carried by VL or IR. The signals travel down the fibre by repeated total internal reflection
