Resonance Cavities Concept

Demonstrations in Resonance Cavities

Three wooden organ pipes of increasing length lying on a green surface; the smallest has a removable stop, the middle one has a thin wood membrane panel, and the longest has a glass window
Safety

Special Organ Pipes

Three specialized wooden organ pipes designed to illustrate open vs. closed pipe resonance and visualize standing wave nodes using sand and cork dust. **Note: All three pipes are currently non-functional …
Four corrugated plastic tubes with flared ends in orange, red-white striped, pink-green striped, and light blue, laid out on a gray surface
Safety

Whirling Tubes

Demonstrates harmonics of an open pipe. Spinning a corrugated tube faster excites successively higher harmonics, producing discrete pitch jumps rather than a continuous glissando — a vivid illustration of standing …
Ruben's tube in a darkened lecture hall showing a row of small flames along the full length of the copper tube, with speaker and signal generator at the left end
Safety

Ruben's Flame Standing Wave Tube

Visualizes standing acoustic waves using a propane-filled tube with rows of small flames that respond to pressure variations. Students directly observe nodes and antinodes as differences in flame height, connecting …
Tall cardboard carpet tube standing vertically on the floor next to a small blue propane cylinder connected by rubber hose to a Bunsen burner at the base, in front of a chalkboard
Safety

Hoot Tube

A propane flame inside a tall cardboard tube drives thermoacoustic resonance, producing a loud sustained tone. Students observe how heated convective airflow excites standing waves in the tube at a …