I’ve noticed that when you hear the sound and look up, the plan often isn’t there. It is always in front of where the sound is.
In: Physics
Simple answer is light travels faster than sound.
I live near an airport so planes are usually close enough to the ground that I can hear them before the actually cross over. That is a commercial airliner flying somewhere between 500-600 mph I think. A plane at 30k feet plus seems silent somehow.
Military jets can fly faster than the speed of sound so naturally the sound seems to lag. It’s kinda neat imo.
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