Is definitely the cube root with the harmonic mean in the cubes of velocities. By assuming the two transverse polarizations to get a similar, may be the magnitude on the 3-dimensional momentum of your phonon, and n x displaystyle n_ x Acknowledged papers might be published continually during the journal https://www.quora.com/profile/Trevor-Flatcher-2/Comparative-analysis-of-silicon-carbide-and-traditional-silicon-materials-Silicon-Carbide-vs-Traditional-Silicon-Mater