Ultrasonic, Infrasonic and audible waves travel through a medium with speeds ${V_u},\,{V_i}$ and ${V_a}$ respectively, then
Medium
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(a) Velocity of sound wave in a medium is given by
$v=\sqrt{\frac{K}{\rho}}$ where $\mathrm{K}$ is the bulk modulus and $\rho$ is the density.
The classification of sound waves based on wavelength( $\lambda$ ) is independent of speed of sound in the medium( speed depends on properties of a medium).
Hence, $V_{u}, V_{i}$ and $V_{a}$ are all equal.
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