Is there any general information that I can get about these discrete acoustical particles? I know that they have the same wave-like properties as photons, but they also have quite a few differences (i.e. sound by itself diminishes over time and does not exist in places with lack of a medium such as air). What im curious about is the energy related to phonons. What happens to the phonons when sound fades? Suppose im playing an instrument, the air I supply to it causes the air to vibrate in the instrument, thus providing sound. Where does the energy transfer to?Does the wavefunction of the phonon gradually fade from, lets say sin[x] to 0?