Longitudinal travelling wave
Another Version of this Applet, with the graphs of vt and DPt plottedl
Related Applets:
Standing Waves and Traveling Waves
Compare compressions/rarefactions in a longitudinal travelling wave with crests/troughs in a transverse travelling wave
Crests/troughs
in a transverse travelling wave

Compressions/rarefactions
in a longitudinal travelling wave


(1) Separation

The separation between two adjacent crests or troughs
is the wavelength.

The separation between two adjacent compressions or
rarefactions is the wavelength.

(2) Displacement

Particles at these points displace from their equilibrium
positions the most.

Particles at the centres of these regions do not displace from their equilibrium positions. 
(3) Speed 
Speed of particles at these points is zero. 
Speed of particles at the centres of these regions
is the greatest.

The displacements at a certain instant along a longitudinal travelling wave: