Lab 2_ Speed of Sound- Resonance Tube
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Apr 3, 2024
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Lab 2: Speed of Sound- Resonance Tube
Written by: Quinn Jones and Boluwatife Ade-Okanlami
Due: February 6, 2024
Objectives:
●
Determine the effective length of a closed tube at which resonance occurs
for several tuning forks.
●
Determine the wavelength of the standing wave from the effective length of
the resonance tube for each tuning fork.
●
Determine the speed of sound from the measured wavelengths and known
tuning fork frequencies and compare with the accepted value.
Equipment List:
●
Resonance Tubes
●
Tuning forks (500 to 1040HZ)
●
Rubber hammer
●
Thermometer
Experimental Procedure:
1.
Find the temperature of the air in the room and record it in Table 1
2. Adjust the water level to at least 5.0cm = 0.050m
3. Strick a tuning fork with a rubber hammer. Keep the fork vibrating
continuously with a large amplitude. While the tuning fork is vibrating,
another person slowly lowers the water from the top while listening for
resonance. Measure the position of each resonance to the nearest
millimeter. Do this three times and record the values in Data Table 2.
4. Repeat step 3 to locate as many other resonances and record the values
in Data Table 2
5. Use a second tuning fork of a different frequency. Repeat steps 1-4 and
record in Data Table 3.
6. Use Equation 5 to calculate the accepted value of the speed of sound from
the measured temperature and record it in Data Table 1.
7. Calculate the mean and standard error of the three trials for the location of
each of the resonances and record the answers in Data and Calculations
Tables 2 and 3.
8. Use Equation 4 to calculate the appropriate wavelengths. With three
resonances recorded 2 values can be determined. Use mean values of the
lengths to calculate the wavelengths.
9. Calculate the mean and standard error of the number of independent
wavelengths measured for each tuning fork and record the values in the
Calculations Tables.
10.
From the values and the known values of the tuning fork frequencies,
calculate the experimental value for
V
, the speed of sound
11. Calculate the percentage error of the experimental values of
V
compared
to the accepted value of the speed of sound in the Data and Calculations
Table
Data and Calculations Table 1:
Room Temperature = 26
℃
Speed of sound = 343m/s
Data Table 2:
Frequency Fork One = 512
L1(cm)
L2(cm)
L3(cm)
15.4
49.2
68.1
15.5
49.3
72.0
15.6
48.9
69.2
L1(m)
L2(m)
L3(m)
0.154
0.492
0.681
0.155
0.493
0.720
0.156
0.489
0.692
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