See

  • Differential Equations

moving shapes $psi(x - vt)$ is a shape moving to the right. $cos(x - vt)$ $cos(kx - \omega t)$

$e^{-(x - vt)^2}$ gaussian wave packets

$\omega = c k$ influence moving far even when the medium doesn’t

from cosines to exponentials

ocean waves

geometric wavefronts

phase velocity group velocity

ball and chain model wave equation \nabla^2 \psi = \frac{1}{v^2} \partial_t^2 \psi

wave matching wavevectors

Periodic media - brillouin book French book

Waves in scattering media

Localizaion

Interference

Double slit Single slit

The semiclassical approximation. Distances give phase

Pipes Thin films

SHO

We did discuss this some elsewhere.

Acoustics

AP French book https://farside.ph.utexas.edu/teaching/315/315.html Oscillations and Waves