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Thread: Resonace with sound but not breaking a glass

  1. #1 Resonace with sound but not breaking a glass 
    Forum Freshman dougieB's Avatar
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    What is something use can do with destructive resonace other than the classic breaking the wine glass trick


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  3. #2  
    Forum Senior Booms's Avatar
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    break peoples eardrums?


    It's not how many questions you ask, but the answers you get - Booms

    This is the Acadamy of Science! we don't need to 'prove' anything!
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  4. #3 Re: Resonace with sound but not breaking a glass 
    . DrRocket's Avatar
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    Quote Originally Posted by dougieB
    What is something use can do with destructive resonace other than the classic breaking the wine glass trick
    Believe it or not that phenomena is due to constructive resonance -- the superposition of two waves to reach a peak amplitude that is the sum of the peaks of the individual waves.

    Constructive and destructive resonance are responsible for the patterns of light formed in the classic double slit experiment. It is also the basis for the use of optics to make extremely precise distance measurements.
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  5. #4  
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    Clean things - part of the dirt-dislodging effect of sonic cleaners is from resonance.
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  6. #5 Re: Resonace with sound but not breaking a glass 
    Time Lord
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    Quote Originally Posted by DrRocket
    Quote Originally Posted by dougieB
    What is something use can do with destructive resonace other than the classic breaking the wine glass trick
    Believe it or not that phenomena is due to constructive resonance -- the superposition of two waves to reach a peak amplitude that is the sum of the peaks of the individual waves.

    Constructive and destructive resonance are responsible for the patterns of light formed in the classic double slit experiment. It is also the basis for the use of optics to make extremely precise distance measurements.
    So to add to what Dr. Rocket said, you can use destructive resonance to cancel out sound, making it totally quiet, or at least quieter. Start a loud speaker blasting really really loud, put another loudspeaker between you and the first one playing the opposite portion of the same sound waves, and see how quiet the first one sounds. Should work better outdoors than indoors, because indoors the sound gets reflected off of walls, which complicates the effect.

    That's how "noise cancellation" earphones work.
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  7. #6 Re: Resonace with sound but not breaking a glass 
    . DrRocket's Avatar
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    Quote Originally Posted by kojax

    That's how "noise cancellation" earphones work.
    Yes. And there are industrial vibration dampers for heavy machinery that use the same basic principle.
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