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Why do sirens sound weird when ambulances or fire trucks drive by?

April 26, 2017ambulances drive sirens sound trucks weird

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Why do sirens sound weird when ambulances or fire trucks drive by?

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When the vehicle is moving towards you, the sound waves are shoved in front of it, and that makes them sound higher-pitched – then, after it has passed and is moving away from you, the sound waves slow back down and you hear the pitch drop.