Why do sound waves emminating from the front of an object moving forward become compressed for the observer also standing at some point in front of the object?
I mean, I get that this is responsible for the Doppler effect, etc, but why do the waves actually *compress*? Is it because the observer sort of hears a layered effect of simultaneously hearing a more outer-ring sound wave that the object gave out when it was farther away, on top of more inner-ring sound waves as the object moved closer?
If that was the case, wouldn’t that indicate that as a sound wave moves out from an object (moves from being a more “inner ring” sound wave to being a more “outer ring” sound wave), the pitch drops? Ie. Taking two unmoving observers and an unmoving sound source, the further away observer would hear the sound as a lower pitch. But that’s not the case, from what I understand. For still sources and observers, only the volume will drop if the observer is further away, not the pitch. So I don’t see how “layering” sound waves of identical pitch could be responsible for the compression.
So how do sound waves ACTUALLY become compressed, or is it just something we know that they do?
I hope my question makes sense! :-)
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