lordsavethee

I got it clarified through a friend. The wavelength is the distance between two crests or troughs and when the source is moving towards the observer, the distance between subsequent crests is shortenend and hence the reduced wavelength. The frequency however is the same. Only the apparent frequency changes. Do you not agree?

I do not understand how the wavelength of sound changes depending on the distance between the moving source and the observer. Its as if the sound waves have foresight as to how far the objects is and adjust wavelength. Please explain.