What exactly carries a radio signal through a vacuum if there’s no particles to experience a change in an electric field?
In: Physics
Electromagnetic waves (light, radio, x-rays, etc) don’t need a medium to travel in. This is different from all of the other waves (sound, earthquakes, gravitational) and that is why scientists thought the universe must be full of a medium called aether and light propagated through that.
Eventually quantum physics proved that you don’t need a medium, as well as many other crazy ideas.
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