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Physics, Astronomy & Cosmology / Hemholtz Exhaust

« on: 27/01/2020 19:22:32 »

So I want to put a helmholtz resonator on my 2 stroke bike engine to remove a certain frequency. My question is, Does the diameter of the main pipe need to be the same as the diameter of the hemholtz resonator? Also does it matter what angle the resonator intersects with the main pipe?

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Physics, Astronomy & Cosmology / Finding Wavelength

« on: 27/01/2020 17:55:13 »

I used audiotool to find a frequency of 242Hz. This is the frequency of my 2 stroke engine. The distance between two peaks is 750. But it doesn't say units. How many meters is this? 7.5, .75, .075 etc.

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Chemistry / Dry Ice

« on: 07/01/2020 01:09:34 »

Dry Ice goes through sublimation. A process in which the solid dry ice turns to gas. I have two questions. If you could keep it in a 100% insulated metal box (gas can't escape)what will happen to the gas if it's even possible to have a 100% insulated box? And will it stay cold?

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Physics, Astronomy & Cosmology / Muffler Destructive Interference?

« on: 01/01/2020 01:37:25 »

I'm trying to come up with a new muffler design. In the illustration, it shows exhaust air going equally into the two tubes. Once they intercept at the bottom straight head on, will the sound quiet due to destructive interference? Would it cause too much backflow or pressure?

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Physics, Astronomy & Cosmology / Bottles And Hemholtz Resonace?

« on: 30/12/2019 19:26:29 »

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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Physics, Astronomy & Cosmology / What happens to the direction of wind that hits a flat bladed wind turbine?

« on: 16/12/2019 18:47:15 »

Does the wind move in a circle like in the picture? Does it move downward? Does it move backwards? Does it keep going straight?

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Physics, Astronomy & Cosmology / What is the best material to absorb 4000 hertz frequency?

« on: 10/12/2019 17:40:06 »

It's not for contruction or room modification purposes. I just want to know the material whether practical or not that is best for sound absorbtion, not sound proofing, of a high frequency of 4000 hz. (chainsaw sound)