use of electromagnetic waves in communication

radio waves

Industrial ovens and mobile phones

Microwaves

Satellite communication and domestic ovens

Infrared

Remote controls and motion detectors

Visible light

Imaging and illumination

UV

Tanning

Gamma

Medical tracing

How to phones travel to the next?

• radio waves are sent and recieved to a mobile phone base station

• The base station passes the signal to the landline network or to the mast closest to the phone the call is being made to

• Phone masts can act as repeater stations.

Microwaves and radio waves

• microwaves are used to send signals to and from satellites and can relay signals around the earth

• Microwaves are used because they can pass through the earths atmosphere and can travel through the vacuum of space

• Signals may be used for weather forecasting and spying

• Radio waves cannot be used because they are reflected by the earths atmosphere and do not penetrate into space.