Amplitude
Amplitude is the maximum displacement of particles from their mean position. It is related to loudness and to the energy carried by the wave.
Try the simulator
Amplitude
Adjust amplitude; see displacement and loudness indicator.
Amplitude and loudness
The amplitude of a sound wave is the maximum displacement of the vibrating particles. Larger amplitude means a louder sound (more energy per unit time crossing a unit area). Doubling the amplitude of a wave increases the intensity (and perceived loudness) significantly.
✔ Key takeaway: Amplitude = maximum displacement; larger amplitude → louder sound and more energy.
Link to simulator: Use the amplitude slider to see how displacement and loudness change together.