Abstract
For gas mixtures of very heavy with very light molecules, solution of the dispersion relation shows that at moderately high frequencies there are two distinct modes that must be taken into account in describing forced sound propagation, a fast wave and a slow one. Detailed properties of these modes (incorporating small corrections to published results) are presented for Xe-He, and the physical nature of the modes is discussed. The slow wave is found to be essentially a sound wave in the heavy species alone, whereas, at sufficiently high frequencies, the fast wave becomes a dusty-gas-type disturbance in the light species.
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