sound-energy flux
2.69 sound-energy flux. Time-average of the time rate of flow of sound energy through a specified area. Unit, watt (W); symbol, J.
volume velocity
2.65 volume velocity.
spectrum density
2.46 spectrum density. Limit, as the bandwidth approaches zero, of the quotient of mean-square value of an acoustic variable by bandwidth. .
wave number
2.28 wave number. (a) 2π divided by the wavelength of a periodic wave. (b) Angular frequency divided by speed of sound. Unit, reciprocal meter (1/m); symbol k = ω/c.
wavelength
2.27 wavelength. For a simple harmonic wave in an isotropic medium, perpendicular distance between two wavefronts in which the displacements have a difference in phase of 2π radians. Unit, meter (m); symbol λ, λ = c / f.