Abstract
The interaction of conduction electrons with acoustic phonons is studied from the general point of view. Parmenter's theory of acousto-electric effect in the high frequency range is criticized for several reasons. It is shown that Weinreich's relation between acousto-electric effect and the absorption coefficient of acoustic waves holds only in the high frequency range, and the limitation to its application is also discussed. New magneto-acoustic resonance suggested by the present author is examined qualitatively.
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