Here's a breakdown:

* Particle wave: A wave describing the probability of finding a particle at a given point in space.

* Displacement: The distance of a point on the wave from its equilibrium position.

* Amplitude: The maximum displacement of the wave from its equilibrium position.

Think of it like a vibrating string. The amplitude is the maximum distance the string moves up and down from its resting position. Similarly, for a particle wave, the amplitude represents the maximum probability of finding the particle at that point.