### Strutt Help

Wavenumber    1/1, 1/3

Strutt|Fundamentals|Wavenumber inserts the wavenumber of a sound wave in air into each octave band or 1/3-octave band of the selected row.

The wavenumber (k) is calculated as:

k=(2pi)/lambda, where

lambda = c//f is the wavelength of the sound wave
c is the wave velocity, temperature dependent (343 m/s at 20 °C)
f is the frequency of wave (Hz)

The user may calculate the wave velocity as a function of temperature (using the Speed of Sound calculation) or else use the default value of 343 m/s.