Planck-Einstein-de Broglie type relations for the acoustic waves
  In this paper we prove, by expressing the energy as a function of the wave propagation speed, it is highlighted the existence of an equivalent mass of the wave, as well as of an Einstein type relations between the energy and this mass. Also, we establish a relation between angular frequency and energy similar to that of the Planck relation. For the propagating wave, there is a de Broglie type relationship between the linear momentum and the action variable (the angular momentum), i.e. the wave linear momentum is proportional to the wave number, the proportionality coefficient being the action. 
Ion Simaciu, Zoltan Borsos, Gheorghe Dumitrescu and Anca Baciu
physics.gen-ph