amplitude?? don't know how this applies?Originally posted by Isosceles_CAT
It depends on a number of factors such as the original amplitude and frequency content of the sound,
When trying to measure things like this, RT60 is an important term to keep in mind.
OK, first lets try to make this into something we could potentially calculate. So we assume that the sound will be travelling through air of temperature X, humidity Y, and at an altitude or pressure of Z. I'm sure that there are many other factors involved but its clear these are the main ones ...anyway they have the potential to act on the way the wave moves through the air.Originally posted by The Electrician
How long does a sound travel for, before it's dispersed into nothingness?
Its quite simple, really. The question was not about the length of a cycle of a sound wave. Mike Richards simply threw in a fact about the length of a cycle of a 20hz wave for kicks. The question was: "How long does a sound travel for, before it's dispersed into nothingness?". Again, the question was: "How long does a sound travel for, before it's dispersed into nothingness?". As you can read, no reference to cycle or period is made.Originally posted by codex
the question has everything to do with the life span of one cycle and absolutely nothing to do with amplitude [if it does please explain]
RT60 refers to the time it takes an impulse to decay by 60db from its peak amplitude or 1/1000 of its original power. While this is a term generally used to measure reverberation times, it also provides a more solid reference to an 'end point' of the sound in question than 'disperses into nothiness'. The point at which a sound of a particular initial amplitude can be thought to have 'dispersed into nothingness' is highly subjective, where as the point at which a sound of a particular initial amplitude reaches 1/1000 of its original power is not.and rt60 is in reference to the environment, how many walls or objects are defeating the sound wave? I am taking a position that you are in the dessert, with nothing around, therefore nothing to reverberate off of and therefore rt60 is irrelevant. If you want to calculate rt60 into the equation, there is no answer because rt60 is a variable sausage dependent on room size and contents. but 20hz unabstructed @70 degress F will travel 56.5 feet p/cycle.