As they vibrate, they pass the disturbance of energy to the particles next to them, which passes the energy to the particles next to them, and so on.
Energy travels down the spring and reflected like the motion of a mass on a spring.
<u>Explanation</u>:
Particle motion is the superposition of a large component due to the fluid drag toward the filter barrier and a random component due to Brownian motion.
The particles of the medium just vibrate in place. As they vibrate, they pass the unsettling influence of energy to the particles beside them, which passes the energy to the particles by them, etc.
Energy goes down the spring and reflected like the movement of a mass on a spring.
