Question

why is the sound of siren in ambulance or a fire extinguisher different from the horns used by other vehicles​

Answer 1

Answer:

As the ambulance moves away from you, the distance between you (the observer) and the siren (source of the sound) increases. Therefore, the sound waves get to spread out in a bigger area, thus making you feel as if the siren sounds low-pitched, or just different!

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Answer 2

they are emergency vehicles . so need to understand very fastly for a longer distance