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Thread: How can I create an impedance mismatch between two materials significant enough to prevent ultraspund 1-20mHz from passing through if possible?

  1. #1 How can I create an impedance mismatch between two materials significant enough to prevent ultraspund 1-20mHz from passing through if possible? 
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    Is this possible in your opinion? In my home country we have limited materials so please aid me.


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  3. #2  
    Forum Ph.D.
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    Anything that will stop sound will have a good chance of blocking ultrasound. Experiment with what you have available. In science there is no substitute for experimentation.


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  4. #3  
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    Sound is reflected by hard surfaces at a density interface. air>metal or ceramic.
    Vacuum insulates sound completely. It must pass through the hard container, around the vacuum.
    Soft, elastic closed cell foam is a good bet, but may transmit certain frequencies.

    Sound will travel around any unclosed barrier.
    Is the source transmission to air?
    Are you shielding the source (boxed in) or shielding from the source (boxed out)?
    This all depends on what you are trying to do.
    Describe the setup.
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  5. #4  
    Forum Cosmic Wizard
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    Quote Originally Posted by G O R T View Post
    This all depends on what you are trying to do.
    Describe the setup.
    From his previous post, he wants to grow his hair back. He feels the government is sending ultrasonic balding rays at him.
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  6. #5  
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    Just at him? Baldness as a human trait predates ultrasound by quite a bit.
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  7. #6  
    Forum Cosmic Wizard
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    Quote Originally Posted by Sealeaf View Post
    Just at him? Baldness as a human trait predates ultrasound by quite a bit.
    Just at him. He has been targeted. He's started perhaps a dozen threads about it.
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  8. #7  
    Forum Professor Zwolver's Avatar
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    Owkay, seems legit. I hear aliens use mind control devices to make us go to war, and make people stupid. Maybe this has something to do with him thinking the government is making him bald?

    Hitting your head with a brick will cure baldness, for sure.
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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