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Double-Slit Experiment (2D)

Interactive 2D double-slit experiment: fire particles through two slits and watch quantum interference fringes build up on the screen, with live fringe spacing computed from wavelength, slit separation and screen distance.

Physics & Mechanics2DEasy60 FPS📱 Mobile-adapted⇄ 3D version

This 2D simulator fires particles one at a time from an emitter through a barrier with two slits toward a detector screen, accumulating an interference pattern in real time exactly as in the historic double-slit experiment. Adjust the wavelength and slit separation to watch the live fringe-spacing readout (Δy = λL/d) update, and toggle path observation to see the fringes collapse into two particle-like bands the instant a measurement reveals which slit each particle used.

⚙ Under the hood

Fire particles one at a time through two slits and watch a real interference pattern build up on the screen, with live fringe-spacing readout computed from wavelength and slit separation.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install