When two coherent wave sources overlap, do they interfere — and does the pattern obey the wave equation's dispersion relation?
▶ Launch the interactive simulationDrive two in-phase point sources on a 2-D membrane (the wave equation ∂²u/∂t² = c²∇²u, absorbing borders), watch their circular waves overlap, and measure the wavelength λ from the field's spatial autocorrelation.
interference — bright bands where the paths differ by a whole wavelength, dark nodal lines where they differ by a half — and the dispersion relation c = λ·f (the measured phase speed matching the model's wave speed)