. "c" . "\\(c = \\frac{\\omega}{k} = \\lambda f\\), where \\(\\omega\\) is the angular frequency, \\(k\\) is angular wavenumber, \\(\\lambda\\) is the wavelength, and \\(f\\) is the frequency."^^ . . "In a dispersive medium sound speed is a function of sound frequency, through the dispersion relation. The spatial and temporal distribution of a propagating disturbance will continually change. Each frequency component propagates at its own Phase Velocity of Sound." . "http://en.wikipedia.org/wiki/Speed_of_sound"^^ . . . . "Phase speed of sound"@en . "belongs to SOQ-ISO" . .