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PolskiRutherford's Gold Foil Experiment (2D)
2D companion to the 3D gold-foil scattering lab: fire alpha particles at a foil of gold atoms and watch the real tan(θ/2) = D/b Rutherford scattering relation decide each deflection, comparing the nuclear model against the falsified plum-pudding model.
This 2D companion drives the same tan(θ/2) = D/b Rutherford scattering relation as the 3D version through a side-view canvas: alpha particles fire from the left at a line of gold nuclei, each deflection is computed from the true impact parameter to the nearest atom, and a live log-scaled histogram shows the scattering-angle distribution filling in as particles accumulate — sparse at large angles under the nuclear model, and essentially empty past a few degrees under plum pudding.
tan(θ/2) = D/b: a small impact parameter b against a concentrated nuclear charge D gives a large deflection, occasionally reversing the particle outright — the result the diffuse plum-pudding charge distribution could never produce.
2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install