Measure the speed of sound not only in air but also in other gases with this Standing Wave Sound Tube. Its built-in microphone and loudspeaker detect and generate sound, letting you display the results on an oscilloscope. Our special impedance matching circuit ensures the results displayed are as clear as possible.

Here are some of the experiments you can perform with the Standing Wave Sound Tube: determine the resonant frequencies of columns in open and closed tubes; observe the variation in amplitude along a standing wave and study wave phase variation using the Lissajous method.

The heavy-duty sound tube is 50cm long and contains two transducers, one for generating sound and the other for detecting it. The sound-generating transducer is located at one end of the tube and the sound-detecting transducer is mounted on a sliding piston. By moving the piston, students can find the nodes and antinodes. This apparatus is accurate enough to detect changes in sound velocity that occur as the temperature in the tube rises. The fixed sound transducer is powered by a function generator that you supply. The second transducer can be connected to your oscilloscope through the impedance matching circuit, to make sure your results are clear and precise.

Closed construction enables you to easily perform experiments in other gases besides air. It also enables you to use low sound intensities so students won't disturb each other's work. Includes a plastic tube; a stationary sound source located in one end of the tube; a movable microphone located in the other end of the tube, and instructions. Requires a Function Generator and Dual Trace Oscilloscope.

Specifications:

Heavy-duty sound tube 50cm long; 2.5cm inside diameter. Microphone and sound source are identical transducers with the following specifications:

• Impedance: 32 ohms
• Sensitivity: 100db SPL with 1mW input
• Maximum Input Power: 50mW
• Frequency Response: 50 to 20,000Hz