# Test-tube Sounds Lab

## Question:

What is the effect of the air column height on the frequency of test tube sounds?

## Equipment:

 test tube small straw test tube rack TI-83 calculator TI-Calculator Based Laboratory (CBL) CBL Microphone TI Calculator to CBL cable FREQ1 program on TI-83

## Data Table 1:

 Test tube diameter Test tube height Height of 66% air column Height of 33% air column

## Data Table 2:

 Trial 100% air column 66% air column 33% air column 1 2 3 4 5 Average

## 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:

1. Complete the table of test-tube sound periods.
 Height of air column 100% 66% 33% Average measured frequency Calculated average period
2. Use the straight line of your graph to estimate these frequencies.
 Height of air column 80% 50% 0% Estimated frequency
3. Do you think the frequency estimate for the 0% air column height is accurate ? Explain your answer.
4. Algebra bonus question: Describe the line graph in slope-intercept form.