Radio waves are a type of energy that travels through the air, just like sound or light. They are used to transmit signals and information for things like radios, televisions, and cell phones. Full definition
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The idea is to prevent government controlled radio waves from reaching one's brain. (wattsupwiththat.com)
Out in space, their chemical bonds spin and flex enough to emit radio waves we can detect. (newscientist.com)
The main complaint about baby monitors is that because they use radio waves to transmit noises and images, they experience a lot of interference and static. (pregnancy-info.net)