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The group velocity is defined as follows v=(1/2)(g/k)^(1/2). How would you start calculating how far away the storm is?

Homework Statement : The dispersion relation for long-wavelength surface waves in deep water is ω=(gk)^1/2 . Waves of a fixed wavelength (or period) travel at their group velocity. Surface waves generated by a storm in the mid-Atlantic and having a period of 15 seconds arrive at the...