Abstract
It is shown that the relativistic acoustic Doppler effect is a function only of the relative source/observer velocity if, and only if, the acoustic speed equals the speed of light. In this limit, the acoustic formula reduces to the well-known optical Doppler equation. This clearly demonstrates the superfluity of a material medium for light propagation in vacuum and provides yet another illustration of the unique status of the speed of light within the framework of special relativity.
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