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Microwaves. They give off microwaves!

Also light bulbs (visible EM), heating coils (infra-red EM), and ovens (infra-red EM).

Also radios and TVs receive radio waves, garage-door openers generate and

transmit radio waves, blow-driers irradiate the air passing through them with

infrared (heat) waves, smart and dumb cellphones all send and receive radio

waves, laptops on wireless home wi-fi send and receive radio waves, and their

screens generate and radiate visible light waves which make it a lot easier for

us to see what they're computing.

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Q: What home appliances use electromagnetic waves?
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