When the sound source and the listener move relative to each other, they feel that the pitch of the sound determined by a certain frequency changes. For example, the siren heard when the train is over is slightly higher in tone, whereas the train hears a slightly lower tone when it leaves. This phenomenon is called the Doppler Effect.
When the sound source is moving at a certain speed and the listener is stationary, the sound intensity (sound pressure) also has a similar change, and the closer sound source is at the same distance than when it does not move. The removed sound source produces less intensity.
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