- Nov 25, 2004
I'm sure there are measurements somewhere on the net, but it's not something that would be in any of my books.
You can certainly hear aircraft in the cruise from the ground though. I live near the Melbourne - Sydney track, and they go past here at up to F400, and they are all audible.
The fans of maths can let themselves loose here with some basic formulae :
Attenuation of Sound Waves
There is an ISO standard in regards specific atmospheric attenuation calculation of sound waves: