I know a car sounds different approaching vs leaving but what is happening re sound waves and is there a similar effect with light waves?
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The sound waves are squished because as a vehicle approaches you the individual impulses need to travel a shorter distance each time making them reach you faster. The opposite happens when a vehicle moves away from you.
And yes, this works for light too. Iirc we use it to determine how fast objects in space are moving relative to Earth.
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