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Equipments used in this experiment are (see Figure 1): Two microphones, metal rods, resonance tube, thermometer, function generator. In part I, place the two microphones at either end of the lab table, about 1.5 meters apart, with both facing the same direction (Figre 2). The program in part I is located at 'Lab programs -> 207 Labs -> Speed of Sound(see Figure 3). The program in part I is located at 'Lab programs -> 207 Labs -> Frequency and wavelength (see Figure 4). In part II and III, place microphone B at the end of the tube by the loudspeaker (see Figure 5).

[Click on images to enlarge.] 1 2 3 4 5

• Perform the experiment ahead of time!
• Remind the students which is microphone A and which is microphone B.
• Adjust the amplitude to have proper sine wave on screen.
• In part III, you may want to remind the students that the distance between adjacent maxima is one-half wavelength.

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Take a look at these CUPOL experiments for an on-line laboratory experience:

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