Experiment 13

THE VELOCITY OF SOUND IN AIR

PROCEDURE


1.  Open up the Sound Workbook, and fill in the header information.

2.  The laboratory instructor will set the oscillator at some definite frequency f1 , and inform you what this frequency is. Record the value in cell B14 on the Worksheet.

3.  Next, determine the locations of at least three (preferably more) points of maximum loudness in the resonance tube. Record these data in cells B17:B22 of the Data Table on the Worksheet .

4.  Your Instructor will set the audio oscillator to another frequency, f2. Record the value of the frequency in cell C14. Again determine the locations of at least three (preferably more) loudness maxima and record them in cells C17:C22 on the Worksheet.

5.  Your Instructor will set the audio oscillator to a third frequency, f3. Record the value of the frequency in cell D14 and the locations of loudness maxima in cells D17:D22.

6.  Record the room temperature in degrees Celsius and enter the value in cell D34. The value of the calculated speed of sound at this temperature will appear in cell D35. DO NOT ALTER this entry.

7.  Your Instructor will set the audio oscillator to an unknown frequency, fx. Determine the locations of loudness maxima as before and record them in cells E17:E22 on the Worksheet.

8.  Print out the Worksheet and use it to develop your lab report.