The student clearly states the independent variable as the frequency of the external acoustic source and the dependent variable as the resonance length in the open-ended resonance tube. However, the research question lacks specificity regarding the method of analysis for measuring the resonance length, which should be explicitly described for clarity. While the background theory is well-articulated and relevant to the investigation, the methodology suffers from insufficient detail, particularly regarding the choice of sampling technique and the rationale behind the number of trials. Despite these shortcomings, the student successfully identifies and addresses controlled variables, safety, ethical, and environmental issues associated with the investigation.
