GCSE Physics – Uses of Microwaves in the Electromagnetic Spectrum

Main Ideas

Microwaves in Cooking

Microwaves transfer energy to water molecules in food, increasing their thermal energy. The water molecules then transfer energy to the rest of the food, raising its temperature.

Microwaves in Satellite Communications

1. A transmitter sends a microwave signal carrying information, such as a television programme, through Earth’s atmosphere to a satellite.
2. The satellite amplifies the signal and retransmits it towards Earth.
3. A receiving dish picks up the signal so the recipient can use it.

Satellite communications are used for television, phones, the internet, and military communications.

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