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2 November, 00:47

a fire truck siren siren getting louder as it braces towards you and quieter as it moves away is called

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  1. 2 November, 02:09
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    As distance from the sound source increases, the area covered by the sound waves increases. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less. This explains why even loud sounds fade away as you move farther from the source
  2. 2 November, 03:07
    0
    Doppler effect.

    Explanation:

    Of course, to an observer on the truck, the pitch does not change at all.
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