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Thread: sirens noise change?

  1. #1
    babyDavid

    Default sirens noise change?

    yes i know. the title made no sense but hear me out.

    you know how when an ambulance passes by and the noise changes? like it goes slightly lower? why is that? i notive it with cars that have the radio really loud too. what causes the sound to change?

  2. #2
    Ryga

    Default

    It's called the doppler effect, I don't know much about it but theres probably a bunch of stuff on the internet about it.

  3. #3

    Default

    It is indeed the Doppler Effect. It happens when sound waves from the siren in front of the ambulance are compressed by the front of the moving ambulance, but are more stretched out in the back. The frequency goes up (hence a higher pitch) in front because the waves are closer together, and down in the back because they're farther apart. At least that's what I understand of the Doppler effect from a basic science class.

    In case that doesn't make sense, here's a visual aid:
    Click image for larger version. 

Name:	u10l3d3.gif 
Views:	43 
Size:	5.5 KB 
ID:	7947

  4. #4
    babyDavid

    Default



    Quote Originally Posted by Gaius View Post
    It is indeed the Doppler Effect. It happens when sound waves from the siren in front of the ambulance are compressed by the front of the moving ambulance, but are more stretched out in the back. The frequency goes up (hence a higher pitch) in front because the waves are closer together, and down in the back because they're farther apart. At least that's what I understand of the Doppler effect from a basic science class.

    In case that doesn't make sense, here's a visual aid:
    Click image for larger version. 

Name:	u10l3d3.gif 
Views:	43 
Size:	5.5 KB 
ID:	7947
    ohhhh. NOW that makes sense. thanks for the visual aid, it helped drive the point home. thanks

  5. #5
    DrunknFox

    Default

    Doppler Effect.

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