What is the difference of a radio wave than a sine wave?
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A sine wave is really a mathematical object, it’s a waveform that oscillates up and down at a constant frequency defined by the equation y = sin(x).
Radio waves are an oscillation of electric and magnetic fields, as such they can be close to pure sine waves or they can have much more complex wave forms. Any real wave is always going to be slightly different from a pure sine wave at the very least because it has a start and end where as a pure sine wave is infinite in length.
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