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In Reply to: RE: Official word? - Refractory Period :-) nt posted by DragonEars on April 27, 2016 at 15:30:51
I always thought a refractory was where oil turned into gasoline?
Too much is never enough
Follow Ups:
I don't know about "refractory period", but refraction occurs when there is a difference in air temperature at different elevations, and sound is thus directed upward or downward from the horizontal. The effect varies with frequency.
Don't worry, this won't affect your home stereo. Outdoors, or in large spaces such as arenas, it is a variable to consider.
:)
Actually, refraction is ALSO an optic phenom.
And, I suspect the 'picket fencing' of High Frequencies I hear when listening to the Pole Piece side of my panels is ALSO a refractory Phenom. Or is that diffraction?
I believe the 'bending' to which you refer is caused by differences in speed of transmission THRU whatever media is under discussion. Also, the speed of sound varies considerably depending on air density.
Can Gravitational Lensing be considered a Refractory Phenom?
Probably Best NOT to give me a serious answer when I'm being goofy.
Too much is never enough
Hopefully, this is not too serious of an answer:
On topic: When I stand on the opposite side of my heat-producing grill, the SPL of my neighbor's dog yapping is somewhat reduced (in my mind).
:)
Source: Acoustical Designing In Architecture by Knudson and Harris.
Edits: 04/28/16
The document you picture doesnt' take account of air pressure.
How much difference in the speed of sound does altitude make, when correcting for air temp?
I don't know, if the difference is say, sea level to 10,000 feet.
In a perfect vacuum, sound doesn't transmit at all while in a very dense substance like steel, sound travels very quickly compared to AIR.
According to a quick Google, Speed of sound in water is OVER 4x that in air and in Steel, about 15x that in air.
I'd like to see a scatter plot of Density V Speed of Sound in various materials.
It might be added, that SUBMARINES use the properties of sound at different temperatures to HIDE. If you are on ONE SIDE of a large Temp Difference, the sound will bounce off the interface and you are essentially Invisible to the guy on the other side. It's called a ThermoCline.
Unless you make one HECK of a racket, maybe, like playing the Subs BOSE system too loud!
Too much is never enough
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