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Telephone
If you've ever talked to anyone on a cell phone, or if you've ever used a pair of toy

walkie-talkies, or a bluetooth headset, or a cordless telephone, or Wi-Fi, then

you've used radio waves for two-way communication.

If you've ever used a GPS receiver in the car, or a wireless mouse or keyboard,

or a garage door opener, or listened to music or news on the radio, or watched

anything on TV, then you've used radio waves for one-way communication.

Electricity isn't used for communication, but it's used to power all of those other devices.

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13y ago

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