I don’t really understand what it means when radios “tap into” certain frequencies and how they are transmitted.
In: Physics
Radio waves are, well, waves. An alternating thing going one way then the other. This thing is is an electric field – it creates a force on electrons in the antenna and the result is an electrical signal.
Now, this wave and the signal it creates (which is more or less a copy of the original wave, so the electric signal is also a wave) has a certain frequency. This frequency is the number of times the wave goes back in forth in one second.
Even if multiple frequencies are picked up at the same time, you can use a simple device to ignore all but the one you want, like your ears picking out a specific sound in a song. This device, this filter, allows many radios to transmit in the same place but not get mixed up. By adjusting the filter you can choose which frequency to allow through so you aren’t hearing all of them.
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