H3-12: ROARING TUBE - 4 FT

ID Code: H3-12
Purpose: Demonstrate standing sound waves in air excited by convection currents.
Description: A switch is held closed, activating a nichrome wire coil in a vertical glass tube, leading to a very loud roar at about 130 Hz, the fundamental frequency of a four-foot air tube. This is the classic Rijke tube demonstration with an electrical heater replacing a gas burner and screen as the source of the convection currents.
Availability: Available

H3-12
See the Physics Question of the Week for 9/8/2014 for an example of how this demonstration can be used in class interaction and discussion: lecdem.physics.umd.edu/question-of-the-week-archive.html