Problem S10.9. Derive the wave equations for first sound and second sound in a nondissipative superfluid for

Question:

Problem S10.9. Derive the wave equations for first sound and second sound in a nondissipative superfluid for the case when (OP/OT), = 0 Show that only second sound propagates when the momentum density is zero. Show that only first sound propagates when the super fluids and normal fluids move in phase so v = Vs.

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