wavelength changes in Doppler effect

[Trisphorin]

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is it correct that if the source of emitting sound is stationary, the wavelength is not going to change in Doppler shift regardless of the observer's motion?

because i learned in class that wavelength change during doppler shift is only due to the source's motion. but in the mcat official guide for one of the physics discrete on doppler effect, it said that if an observer is approaching a source, the frequency increases and wavelength decreases. it made sense because v= frequency x wavelength but how could you have a wavelength change if nothing is happening to the source?

 

[muhali3]

because relative to you, the source is moving. all that matters is the relative velocity.

 

[Kimchii]

Because you approach the source, your experience of the frequency and wavelength will change. The waves become cramped together because you have velocity. Its like saying:

I ----I the distance between the two is what the source emits
I --I the distance between the two is what you experience