a glass tube is fitted with a movable piston that allows the indicated length L

Question

a glass tube is fitted with a movable piston that allows the indicated length L to be adjusted a sine wave generator with an adjustable frequency is connected to a speaker near the open end of the tube the output of a microphone at the end is connected to a waveform display you are to use this apparatus to measure the speed of sound in air

Sine-wave Generator Speaker Movable Piston Itt Glass Tube Microphone Meterstick Waveform Display A glass tube is fitted with a movable piston that allows the indicated length L to be adjusted. A sine-wave generator with an adjustable frequency is connected to a speaker near the open end of the tube. The output of a microphone at the open end is connected to a waveform display. You are to use tis apparatus to measure the speed of sound in air. Describe a procedure using the apparatus that would allow you to determine the speed of sound in air. Clearly indicate what quantities you would measure and with what instrument each measurement would be made. Represent each measured quantity with a different symbol. Using the symbols defined above, indicate how your measurements can be used to determine an experimental value of the speed of sound.

Explanation / Answer

Procedure:

1. adjust the movable piston to L=0 m

2. Produce a constant frequency with the sound wave generator and record the frequency as 'f'

3.Adjust the movable piston by gradually increasing L until the amplitude of the wave generated is a maximum plus the sound generated is a maximum.

4. Mark , measure and record the values of L.

5. Repeat step 3 until the next maximum aplitude and volume are generated.

6. repeat step 3 for successive L.calculate ?? and ?avg.

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