H3-13: ROARING TUBE - 8 FT
- ID Code: H3-13
- Purpose: Demonstrate standing sound waves in air excited by convection currents.
- Description:
A switch is held closed, heating a nichrome wire coil in a vertical four-inch diameter galvanized steel downspout tube, leading to a very loud roar at about 65 Hz, the fundamental frequency of an eight-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.
Consider combing this with H3-12, and invite students to make predictions about the differences in pitch and volume.
- Availability: Available
- References: http://www.physics.umd.edu/deptinfo/facilities/lecdem/services/refs/refsh.htm#H3-13