Standing Waves

Interactions

Drag the string sideways and let go to pluck it there; a pluck at the middle leaves no even harmonics
Click the string to rest a fingertip on the nearest node: only the harmonics with a node there survive, and riders on the antinodes are thrown off
Drag the movable bridge to shorten the string; the pitch rises as 1/length
Click the plate's front or right edge to bow it there; a finger damps another edge point and the sand redraws a new figure
Click a tuning fork to strike it; the other fork starts ringing and kicks the pith ball
Click the crumb of wax to load fork 2: it drops to 437 Hz and the two forks beat at 3 Hz