How is wave length determined for a longitudinal wave?

Answer 1

You can find it the same way you would for most other waves, with the formula of

v=fλ

(velocity = frequency x wavelength)

Answer 2

For longitudinal waves, the wavelength is determined by measuring the distance between two consecutive compressions or rarefactions in the medium through which the wave is traveling. This distance represents one complete cycle of the wave. The wavelength is commonly denoted by the symbol λ and is usually measured in meters.