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-- The speed of an electromagnetic wave depends on the electrical characteristics of the stuff

it's moving through. If it's moving through vacuum, then it depends on the permeability and

permittivity of vacuum, and comes out to be 299,792,458 meters per second.

-- The speed of a mechanical wave depends on the mechanical characteristics of the stuff

it's moving through. If there's no material stuff there, then the speed is zero.

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