What is the Doppler effect?
Question asked by: knowitall
This refers to the phenomenon whereby the pitch of a sound appears to change as the object approaches the moves away again, classically we experience this when hearing a police siren. The reason this occurs is that as the object approaches the waves have less distance to travel to the hearing object and bunch up, causing the perceived change in pitch, literally bombarding the ear, then this lessens again as the object moves away.
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