How Does Sound Behavior Change in Low Atmosphere?

[brendanbarnes]

There is no sound in space because there are not enough particles to transmit the pressure wave. But what about really high in the atmosphere where there is just a little air? Would sound move faster, slower or at the same speed? Would the intensity (aka volume) go up, down, or stay the same? And would the frequency go up, down, or stay the same as it traveled through space?

Here are some references that I have personally looked at that might spark good thoughts:
http://www.feynmanlectures.caltech.edu/I_47.htmlhttps://www.khanacademy.org/science...ve-speed-of-sound-in-solids-liquids-and-gases
Thanks,
Brendan

 

[FactChecker]

The speed of sound does change as altitude increases. That speed is called Mach 1. How it changes depends a lot on how the temperature changes. So its behavior changes in different parts of the atmosphere. See Mach vs. Altitude Tables .