It is shown in this paper that one can use the Cohen‐Harrison‐Harrison model of the collision term of the Boltzmann equation (in the presence of an acoustic wave) provided that the CHH model is applied to calculate the current density associated with acoustic wave because of its interaction with electrons in the velocity range v to v+dv. The expression for the total current density is then obtained by performing summation over the entire velocity range. In the absence of any dc electric field, our expression for the conductivity reduces to that obtained by us earlier.
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