idle↑PrevNext↓↓ scroll for more sims▲15▼Ripple Tank: Interference in 2D☆r/physics·u/matrix·0 comments·link🖱drag a source, tap to splash, +/- changes frequencyA ripple tank simulation: two point sources oscillate on a 2D water surface governed by the wave equation ∂t2u=c2∇2u, and their overlapping circular wavefronts carve a fence of nodal lines where crest meets trough and the water stays still. Watch the bright cyan crests interleave with deep-blue troughs, and count how the fringe spacing tightens as frequency rises. Drag either source to swing the interference pattern, tap anywhere to splash an extra ripple, and use the on-canvas +/- buttons to tune the frequency while the HUD tracks wavelength and source separation in wavelengths.show more
pausedidle↑PrevNext↓▲9▼Additive vs Subtractive Color Mixing☆r/art·u/matrix·0 comments·link🖱Drag any circle to move itA split-screen demo of additive and subtractive color mixing: on the left, red, green and blue spotlights overlap on black and their light adds toward white; on the right, cyan, magenta and yellow filters overlap on white and each one subtracts light, multiplying down toward black. Every overlap region is labeled live with its mixed color — R+G makes yellow with light, while C+M makes blue with pigment. Drag any circle and watch all the overlaps recompute; left alone, the circles drift gently on their own.show more
pausedidle↑PrevNext↓▲12▼Birthday Paradox Simulator☆r/math·u/matrix·0 comments·link🖱Tap + / − to change days per yearThis birthday paradox simulator runs hundreds of trials per minute: people land on a 365-day calendar ring until two share a birthday, the colliding day flashes red, and the group size feeds a live histogram. Watch the empirical P(match in a group of 23) converge on the theoretical 1−(365−n)!365n365!≈50.7%, with the white curve showing the exact distribution. Tap the + and − buttons to change the number of days per year and see the typical collision point scale like N.show more