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In general a wave is a possible mean a perturbation propagate. In classical physics linear perturbation essentially propagates only by waves or by diffusion.

As examples, a pressure wave, like a sound wave, is started in a solid by applying a time dependent pressure in a point of the solid. An electromagnetic wave, like those used by cell phone to contact each other or by radars to individuate objects, is created by moving charges that introduce a perturbation in the electromagnetic field.

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Ferne Streich

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2y ago

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