The amplitude of a wave is the maximum distance moved by the particles of a medium on either side of the mean position.
- Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position.
- It is equal to one-half the length of the vibration path. The amplitude of a wave refers to the maximum displacement of a particle on the medium from its rest position.
- In a sense, the amplitude is the distance from rest to crest.