Longitudinal travelling wave

 

 

Another version with the graphs of v-t and DP-t are shown as well


Related Applets:

Transverse Traveling Wave

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: