Why is there a difference in the perceived frequency when the source of sound approaches you as compared to when it moves away from you? What effect does it have on the wavelength?

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Solution

The explanation is as follows.

Yes it happens due to a phenomenon called dopplers effect.
The Doppler effect is the change of frequency of a wave emitted as observed by an observer moving relative to the source. In this, the frequency received by the observer is higher during approach, identical when the relative positions are the same, and keeps lowering on recession of source. If both the source and observer are moving, the total Doppler Effect is calculated based on both these motions.

Yes, it does effect wavelength also. If the frequency of sound increases then the wavelength increases and vice-versa.

You can refer the following link for more details.
Dopplers effect

Hope it answers your question.
All the best!

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