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Doppler effect told us that the frequency and wavelength changed but not the speed of wave if the transmitter or receiver is moving. Could I interpret Doppler Effect as follow:
Frequency/wavelength change for different observers, however, the speed of wave is constant for all observers.
If it is true, why is it so special that Einstein picked the constancy of speed of light as the postulate of SR? Could I use sound instead and then do the Lorentz transformation by using sound wave and say that "speed of sound is constant, nothing can travel faster than the speed of sound"?
Frequency/wavelength change for different observers, however, the speed of wave is constant for all observers.
If it is true, why is it so special that Einstein picked the constancy of speed of light as the postulate of SR? Could I use sound instead and then do the Lorentz transformation by using sound wave and say that "speed of sound is constant, nothing can travel faster than the speed of sound"?