Does A Longer Barrel Reduce Noise Of Fired Shot?

[coop44]

I shot a 10" 30/30 contender for a while, fun to shoot, but, didn't make me many friends at the range.

 

[quneur]

An interesting experiment would be shooting next to a solid wall - made of a material which reflects as close to 100% as possible. The reflected sound would create an interference pattern with the original waves. There should be a distance where sound would suddenly drop then spike again.

I guess that's why there's stippling on drywall and ceiling. Breaks up reflected waves.

 

[Flopsweat]

An interesting experiment would be shooting next to a solid wall - made of a material which reflects as close to 100% as possible. The reflected sound would create an interference pattern with the original waves. There should be a distance where sound would suddenly drop then spike again.

I guess that's why there's stippling on drywall and ceiling. Breaks up reflected waves.

I read recently that a typical gunshot goes from about 800 hz to 4,000 hz, which would translate to wavelengths from about 3 to 16 inches. there's a bit of math between that and how far to be from the wall, but it sounds like it should be just a few inches. Then again, there's probably an acoustics expert here who can tell us how I'm wrong about everything I just typed. But anyway it's fun to think about.


edit: sp

 

[Mike_M57]

I read recently that a typical gunshot goes from about 800 hz to 4,000 hz, which would translate to wavelengths from about 3 to 16 inches. there's a bit of math between that and how far to be from the wall, but it sounds like it should be just a few inches. Then again, there's probably an acoustics expert here who can tell us how I'm wrong about everything I just typed. But anyway it's fun to think about.


edit: sp

If you could fart at the proper time/frequency, you could be your own noise-cancelling system.

The NRA did some research along those lines for competitive shooting. Here's a photo of one of the early testers, Stinky Winkerbean III, and his modified Schutenpooper Mk IV.



Research was halted when someone spiked Stinky's cabbage soup with Dulcolax.

 

[quneur]

I read recently that a typical gunshot goes from about 800 hz to 4,000 hz, which would translate to wavelengths from about 3 to 16 inches. there's a bit of math between that and how far to be from the wall, but it sounds like it should be just a few inches. Then again, there's probably an acoustics expert here who can tell us how I'm wrong about everything I just typed. But anyway it's fun to think about.


edit: sp

You are correct. The equation for the surface area of a sphere is 4/3*pi*r^3. The reduction in noise or air pressure would the inverse. A reduction of 1/pi*r^3 is pretty significant.