The disturbance produced in the medium travels onward, passing from one particle to the next.
The amplitude of each particle is the same but the phase changes continuously,
No particle is permanently at rest. Different particles attain the state of momentary rest at different times
All the particles attain the same maximum velocity when they pass through the zero amplitude position
In longitudinal progressive waves all the parts of the medium undergo similar variation in particle density one after the other. At every point there will be a particle density variation.
There is a flow of energy across in the direction of the wave
There is no onward motion of the disturbance as no particle transfers its motion to the next. each particle has its own characteristic vibration
The amplitudes of the particles are different, ranging from zero at the nodes to maximum at the antinodes. All the particles in a given segment vibrate in phase but in opposite phase relative to the particles in the adjacent segment
The particles at the nodes are permanently at rest but other particles attain their position of momentary rest simultaneously
All the particles attain their own maximum velocity at the same time when they pass through the zero amplitude position.
In longitudinal stationary waves, the variation in particle density is different at different points being maximum at the nodes and zero at the antinodes.