Black-body radiation is electromagnetic radiation, so I'm a bit confused how that's connected with acoustic noise. As to molecule collisions, I'm not sure vibrations at sufficiently high frequency can be called "acoustic" at all.
As to molecule collisions, I'm not sure vibrations at sufficiently high frequency can be called "acoustic" at all.
Your reasoning here carries useful information. For example, when you are dealing with vibrations whose frequency is so high that the wavelength of the vibration is less than the average spacing between molecules in a gas, or in a solid lattice, then a lot of what you calculate about the detection and interactions with lower frequency vibrations no longer applies.
However, the same limitations apply to electromagnetic radiation. ...
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.