Does a vibrating spring produce sounds even when they cannot be heard? Use the Thundering Tube amplifier to find out! Pull or shake the spring attached to the rubber drum attached to one end of the Thundering Tube and you will hear an astonishingly realistic “rumbling” sound of thunder. As you vary the length of the tube, students will hear only the sounds that are in resonance with the column length. Even though numerous sound frequencies are produced by the vibrating spring, they are “silenced” until the tube length changes. A perfect demonstration device to explain resonance, amplification and even musical instruments. Includes complete instructions and a reproducible student worksheet.
Concepts: Sound pitch, resonance, amplification. Time Required: 15 minutes Materials Required: Telescoping cardboard tube, latex sheet, metal spring, rubber band.