Casio EA-200 User Manual page 27

Activity: Operating the Equipment Activity: Operating the Equipment
í Measuring the Resonance Points
u Record the sound on the Audio Measurement Setup,
display the waveform, and observe the amplitude.
u Lower the water level, and find the point of maximum
amplitude.
1 Glass Resonance Tube A: Water Level A
Resonance Point 1 B: Water Level B
2
3 L C: Water Level C
1
4 Sound Wave Amplitude
u Lower the water level more, and find the next point of
maximum amplitude.
Glass Resonance Tube
1 D: Water Level D
Resonance Point 1 E: Water Level E
2
3 L
F: Water Level F
1
Resonance Point 2
4
5 L
2
Sound Wave Amplitude
6
u Repeat the measurement three times and calculate
the average of the results.
u Substitute the average values of L
and L
1
theoretical expression and calculate the velocity of
sound.
í Measuring the Temperature of the Air Column
u Use the Temperature Measurement Setup to measure the temperature and then display it.
u Substitute the measured temperature values into the expression and calculate the
velocity of sound. Next, compare the results with the previously obtained value.
v T
= 331.5 + 0.61
v
(m/s) : Velocity of Sound
T
(°C) : Air Column Temperature
1 Glass Resonance Tube
2 Temperature Probe (CH1)
EA-200
3
into the
2
2-7-2
English
í Calculator Operation
u Use the Audio Measurement Setup to record the sound and display the waveform.
u Find the applicable program in the Program Library (P.2-16-2), input it into your calculator,
and then run it.
1 Waveform
2 Amplitude
S :Sound Volume
t
(s):Time
u Confirm that amplitude is at its maximum
for water levels B and E.
u Use the temperature probe to measure the temperature and then display it.
u Find the applicable program (Charles' Law) in the Program Library (P.2-16-1), input it into
your calculator, and then run it.
Other Things To Do
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u Repeat the experiment using a different frequency, and compare the difference in
resonance points and sound velocity.
u Use FFT analysis to determine the frequency at each water level, and compare the
results with the sound source frequency.
u Substitute the observed velocity into the theoretical formula and calculate the open-
end correction value.
u Investigate what you need to multiply the open-end correction value in order to
obtain the inside diameter of the resonance tube.
u Perform 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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Measurement Measurement
Waveform at Water Levels A, C, D, and F
Waveform at Water Levels B and E