Resonance in Air Columns
L = (2n−1)λ/4 (closed pipe)
Guided procedure
- Identify the apparatus and the variables.
- Start with the default settings and note the readings.
- Change one variable at a time.
- Record observations and compare the trend.
- Explain the result using the governing relationship.
For the fundamental mode of a closed pipe, what fraction of a wavelength is the air-column length?
| Trial | Settings | Model response |
|---|---|---|
| No observations recorded yet. | ||
Why should only one independent variable be changed at a time?
Physics V4 · Resonance in Air Columns — Investigation & Assessment Studio
Sound and resonance · Experiment-specific investigation, evidence log, graph analysis and teacher review.
1 · Investigation mission
Objective: Investigate resonance in an air column and identify resonant lengths.
For a closed air column at first resonance, its length is approximately…
Resonance occurs when the driving frequency matches a natural frequency of the air column.
2 · Fault-finding challenge
A student performs this experiment but obtains an unexpected result. Identify the most likely issue.
3 · Observation notebook & graph
Use the original simulation controls to perform a trial, then enter the observed values. This table records student-entered observations; it does not claim to read every legacy simulation's internal sensors.
| Trial | Air-column length (cm) | Resonant frequency (Hz) |
|---|
4 · Practical reflection & report
5 · Teacher assessment rubric
6 · Guided experimental procedure
Follow the sequence below and use the original experiment controls above to change one variable at a time.
- Read the objective and identify the independent and dependent variables.
- Inspect the apparatus and reset the simulation to its initial state.
- Change only the independent variable while keeping other conditions controlled.
- Record at least three observations in the notebook.
- Plot the dependent variable against the independent variable and describe the trend.
- Answer the prediction and fault-finding questions, then write an evidence-based conclusion.
Use consistent units, avoid changing multiple variables at once, and distinguish measured observations from theoretical predictions.