"When the observer is moving, as in Animation 2, the sound waves emitted from the source are undisturbed. The wavelength does not change as observed from the moving observer." https://www.compadre.org/osp/EJSS/3851/model5/85.htm
Unchanged wavelength implies that the speed of the waves relative to the observer varies with the speed of the observer.
Consider an analogous situation: the observer is moving towards a light source. Are the waves undisturbed again? Again, the wavelength does not change as observed from the moving observer? Or the motion of the observer miraculously disturbs the waves, changes the wavelength, and so guarantees that the speed of light relative to the observer gloriously remains constant?
Unchanged wavelength implies that the speed of the waves relative to the observer varies with the speed of the observer.
Consider an analogous situation: the observer is moving towards a light source. Are the waves undisturbed again? Again, the wavelength does not change as observed from the moving observer? Or the motion of the observer miraculously disturbs the waves, changes the wavelength, and so guarantees that the speed of light relative to the observer gloriously remains constant?
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