Forgive me if this has been asked before but I couldn’t find an answer. I was taking a walk and a car drove by and they were listening to a very familiar common pop song from the 2000’s. As it approached it was in tune, but as it drove past me, the further away it got, the more out of tune the song became to me. I have also noticed this driving past live music stadiums. What is this called and why is it happening?
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You know those ball string paddle toys? If you move the paddle into the direction of the bouncing you will notice more bounces per second. If you move it backwards you get fewer. The pitch of a sound is the frequency of those sound-wave-bounces
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