3. For gravity waves in a liquid, the phase velocity c depends on the wavelength >...

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3. For gravity waves in a liquid, the phase velocity c depends on the wavelength > as c = A is a constant. Show that the group velocity is half the phase velocity. A√λ, 3. For gravity waves in a liquid, the phase velocity c depends on the wavelength > as c = A is a constant. Show that the group velocity is half the phase velocity. A√λ,