Additional Info

• 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: REFERENCES: (PIRA 3D30.70)