Test-tube Sounds Lab
Question:
What is the effect of the air column height on the frequency of test tube sounds?
Background:
Hypothesis:
Equipment:
- test tube
- small straw
- test tube rack
- TI-83 calculator
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- TI-Calculator Based Laboratory (CBL)
- CBL Microphone
- TI Calculator to CBL cable
- FREQ1 program on TI-83
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Procedure:
Data Table 1:
| Test tube diameter |
Test tube height |
Height of 66% air column |
Height of 33% air column |
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Data Table 2:
| Trial |
100% air column |
66% air column |
33% air column |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| Average |
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Graph:
- Glue a separate sheet of graph paper in your journal.
- Follow the recommendations of the lab report format.
- Plot a line graph with the IV on the X-axis and the DV on the Y-axis.
- The X-axis should range from 100% to 0% air column height.
- Plot just the average values and connect the points with a straight line.
Conclusion:
Use the lab report format to write your conclusion.
Questions:
- Complete the table of test-tube sound periods.
| Height of air column |
100% |
66% |
33% |
| Average measured frequency |
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| Calculated average period |
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- Use the straight line of your graph to estimate these frequencies.
| Height of air column |
80% |
50% |
0% |
| Estimated frequency |
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- Do you think the frequency estimate for the 0% air column height is accurate ? Explain your answer.
- Algebra bonus question: Describe the line graph in slope-intercept form.