Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: YetiWoodz on 30/12/2019 19:26:29
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Blowing air into bottles is an example of hemholtz resonance. What is the best angle to blow air into it to make sound? Also what size makes it have a lower tone? If you can include neck diameter & length, and chamber diameter & length that would be great. Thanks.
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What is the best angle to blow air into it to make sound? Also what size makes it have a lower tone? If you can include neck diameter & length, and chamber diameter & length that would be great. Thanks.
Are you sure there isn't anything else you would like me to look up on the internet for you?
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Nope
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It should have to do with wave lengths and the form of cavity into where you blow, so a more extended or 'rounded ?' might be able to produce a lower sound. But then they interact with each other too, quenching as well reinforcing the sound. It's a pretty difficult question to answer I think.
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The Helmholtz resonator happens when a "piston" oscillates on the volume of air in the bottle the best angle is found by practice with a particular bottle. the resonant frequency depends on the effective size and mass of the piston of air and the volume of the bottle in both cases the larger the lower frequency. Good low notes are produced by wine fermenting demijohns with a one gallon volume ( see jug bands)
If you drill holes in a reasonably sized bottle that is a good helmholtz resonator you can make a simple musical instrument when all the holes are closed by your fingers the note will be that of the bottle an as the holes are opened the note will change but it will not matter much which of the holes are opened just the number.
The ocarina is a musical instrument that is designed to operate using the principle of the Helmholtz resonator
here is an example of the somewhat mystical sound it makes