What is the difference of a radio wave than a sine wave?
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Think of it like a single musical note compared with a piece of music. A pure musical note can be represented as a sine wave – a curve which repeats with a certain frequency. But piece of music is the sum of lots of different notes of different frequencies and so it becomes a complex non-repeating curve.
Similarly a radio signal can be a single repeating “note”, but is more often the sum of lots and lots of different “notes” so forms a non-repeating pattern.
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