Doppler effect (the sound source moving towards observer)

AI Thread Summary
When the sound source moves towards a stationary observer, the speed of sound relative to the observer remains constant because it is determined by the medium through which it travels. The frequency of the sound increases as the source approaches, leading to a shorter wavelength, but this does not affect the speed of sound itself. The relationship v = f x λ indicates that while frequency and wavelength change, the speed of sound in the medium remains unchanged. The confusion arises from the perception of sound frequency and wavelength, but the fundamental speed of sound is a characteristic of the medium. Thus, the speed of sound relative to the observer does not change.
desmond iking
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Homework Statement



the observer is stationary , but the sound source is moving towards the observer , i was told that the speed of sound relative to the observer doesn't change. why is it so ? in my opinion, the speed of sound relative to observer changed . because of v= f x (lambda) , as the frequency of sound is fixed , but the wavelength of sound waves now changed , (the wavelength now become shorter) , so the speed of sound realtive to the obersver is reduced . am i correct ?

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The Attempt at a Solution

 
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The speed of sound in a medium is a property of the medium, not the source or the observer.
 

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