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Hapankaali t1_j6yz78s wrote

Since you already know about Fourier transforms, it's easier to explain. The Fourier transform of a monochromatic (single wavelength) source is a function that is constant in time. But no realistic phenomenon in nature is infinitely-long-lived. So it's not only common for realistic wave forms to be composed of many wavelengths, it's the case for every naturally occurring source.

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