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**Unformatted text preview: **Solve this by approximation as follows: 7.2.1 First, LOOK for a mode with omega ~ kc_s, ie the sound frequency. LOOK means scale the terms assuming omega ~ kc_s and identify the big and small terms. Then, find omega_0 and then omega_1, by perturbation. State how the viscosity and thermal conduction affect the sound wave. 7.2.2 Next, LOOK for a mode with omega << kc_s, ie below the sound frequency. Find the lowest order nonzero omega in this case. This is the entropy mode....

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