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Considering this, why is sound an electromagnetic wave?
Electromagnetic radiation is the propagationthrough space of electrical and magnetic waves whilesound is the result of small changes in the air pressurethat propagate through the air. We can sometimes seeelectromagnetic radiation (as light) or feel it (as warmth)while we can only hear sound.
Also know, is sound an EM wave if not what kind of wave is it?
No, sound is not an electromagneticwave. Sound is a longitudinal mechanical (pressure)wave, which requires a medium in which to travel. The mediumcan be a gas, a liquid, or a solid. EM waves do notneed a medium in which to travel.
An electromagnetic wave can be created byaccelerating charges; moving charges back and forth willproduce oscillating electric and magnetic fields, and thesetravel at the speed of light.