Dispersion causes bending waves to lose their original waveshape

Evidence

However, bending waves are dispersive. That is, their phase velocity is dependent on frequency. This means that they also have a frequency-dependent group velocity and therefore do not preserve the waveshape of a sound wave containing many frequency components. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 133

Categorization

• DEFINE: Clear definitional contrast: nondispersive means frequency-independent phase velocity that preserves waveshape.