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The angular frequency of the surface waves in a liquid is given in terms of the wave number k by ω = √(gk (T/ρ)), where g is the acceleration due to gravity, ρ is the density of the liquid, and T is the surface tension (which gives an upward force on an element of the surface liquid). Find the phase and group velocities for the limiting cases when the surface waves have: (a) very large wavelengths and (b) very small wavelengths.

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