Activity: Operating the Equipment

￿Measuring the Resonance Points

uRecord the sound on the Audio Measurement Setup, display the waveform, and observe the amplitude.

uLower the water level, and find the point of maximum amplitude.

1 Glass Resonance Tube

A: Water Level A

2 Resonance Point 1

B: Water Level B

3 L1

C: Water Level C

4Sound Wave Amplitude

uLower the water level more, and find the next point of maximum amplitude.

1 Glass Resonance Tube

D: Water Level D

2 Resonance Point 1

E: Water Level E

3 L1

F: Water Level F

4Resonance Point 2

5L2

6Sound Wave Amplitude

uRepeat the measurement three times and calculate the average of the results.

uSubstitute the average values of L1 and L2 into the theoretical expression and calculate the velocity of sound.

￿Measuring the Temperature of the Air Column

uUse the Temperature Measurement Setup to measure the temperature and then display it.

uSubstitute the measured temperature values into the expression and calculate the velocity of sound. Next, compare the results with the previously obtained value.

v= 331.5 + 0.61T

v(m/s) : Velocity of Sound

T(°C) : Air Column Temperature

1Glass Resonance Tube

2Temperature Probe (CH1)

3EA-200

2-7-2

English

Measurementasurement

￿Calculator Operation

uUse the Audio Measurement Setup to record the sound and display the waveform.

uFind the applicable program in the Program Library (P.2-16-2), input it into your calculator, and then run it.

1Waveform

2Amplitude

S :Sound Volume t(s):Time

Waveform at Water Levels A, C, D, and F

uConfirm that amplitude is at its maximum for water levels B and E.

Waveform at Water Levels B and E

uUse the temperature probe to measure the temperature and then display it.

uFind the applicable program (Charles’ Law) in the Program Library (P.2-16-1), input it into your calculator, and then run it.

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uRepeat the experiment using a different frequency, and compare the difference in resonance points and sound velocity.

uUse FFT analysis to determine the frequency at each water level, and compare the results with the sound source frequency.

uSubstitute the observed velocity into the theoretical formula and calculate the open- end correction value.

uInvestigate what you need to multiply the open-end correction value in order to obtain the inside diameter of the resonance tube.

uPerform the activity with a glass tube of a different diameter and find out how the open-end correction value is affected.

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