Slit Experiment SHOWCASE

What you are seeing: a source, an N-slit mask, and a screen, viewed through four interchangeable modes (Wave field, Particle accumulator, Grating, Davisson-Germer). The Fraunhofer formula $I(\theta) = (\sin\alpha/\alpha)^2 (\sin N\beta/\sin\beta)^2$ governs every mode

Figure 1. Slit Experiment legend: source, N-slit mask, screen, with wave/particle/grating/Davisson-Germer modes. Method: closed-form Fraunhofer (sin alpha / alpha)^2 (sin N beta / sin beta)^2 + rejection-sampled particle hits.

modewave

N slits2

slit width a (um)2.0

slit pitch d (um)10

particleph

wavelength (nm)532

electron E (eV)54

particle rate15

WHAT TO TRY

Switch between the four modes: the continuous wave field, the one-particle-at-a-time accumulator, the multi-slit grating, and Davisson-Germer electron diffraction, all on the same source-mask-screen setup.
Run the particle accumulator: single photons or electrons land as random dots that slowly build the interference pattern, the heart of wave-particle duality.
Add slits in grating mode or narrow the pitch d: the principal maxima sharpen and spread, the resolving power that turns a slit array into a spectrometer.