How does the separation between maxima of a two-source interference depend on the distance between speakers, the distance between speakers and detection place, and frequency of sound?SL
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A
Official IB Result
IB Grade: A
Criteria A: Focus and Method
5/6
0
3
6
Criteria StrandsPro
A.1Topic clarity and communication
Excellent
A.2Research question formulation and focus
Good
A.3Methodology appropriateness and completeness
Good
Criteria Feedback
- The student communicated a clear physics topic with a purposeful investigation into interference from two coherent loudspeakers.
- The student's method was substantially planned, with variables, repeated measurements, positioning procedures, and attempts to control obvious sources of error.
- The student showed a good understanding of the practical setup and why a common source helps maintain a stable phase relationship.
- The research focus is still too broad because it combines several relationships in one investigation.
- The operational definition of the measured quantity is not always precise enough, especially when distinguishing a first maximum from fringe spacing.
- The method is limited by the fact that the geometry does not fully suit the far-field model the student later relies on.
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria StrandsPro
B.1Subject knowledge application
Good
B.2Use of terminology and concepts
Good
Criteria Feedback
- The student uses correct physics vocabulary throughout, including key ideas such as interference, phase difference, coherence, wavelength, and uncertainty.
- The student's explanations show solid subject knowledge and go beyond simple formula quoting by linking the theory to the experimental setup.
- The student generally defines symbols and units clearly, which helps the report remain accessible and scientifically structured.
- Some concepts are used a little imprecisely, especially the way coherence is described.
- The student sometimes treats the far-field approximation as if it were valid without enough justification from the actual geometry.
- The distinction between the measured broad maximum and the ideal fringe spacing is not always made consistently.
Criteria C: Critical Thinking
9/12
0
6
12
Criteria StrandsPro
C.1Research analysis and evaluation
Moderate
C.2Discussion and argument development
Moderate
C.3Critical evaluation
Moderate
Criteria Feedback
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Criteria D: Presentation
4/4
0
2
4
Criteria StrandsPro
D.1Structure and formatting
Excellent
D.2Layout and visual elements
Good
Criteria Feedback
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- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.