Noticed it today, rather than a gradual build up of noise you just suddenly hear an airplane like it appeared out of nowhere?
In: Physics
sound is actually an after effect on the air around an object and moves much like water. Watch a boat as it slices through the water it pushes water to the sides and creates a wake. The waves up front are shorter and closer together and the farther back from the boat the longer and further apart these waves are. Air moves the same way it just isn’t seen it is heard. the differences is that the shorter waves are higher pitched (closer together) and lower pitched (farther apart)
TL:DR the doppler affect.
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