A-LevelPhysicsWavesOct/Nov 2024Paper 1 Q241 Mark
A progressive longitudinal sound wave moves through air. The diagram shows the positions of the air particles along part of the wave at one instant. [Figure 24.1] Point Q is a distance x from point P. Which graph shows the variation of the displacement of the air particles with distance from P along the wave?
ADisplacement-distance graph starting at zero, increasing to a positive maximum, decreasing through zero to a negative minimum, then increasing back to zero, completing one full cycle (starts positive).
BDisplacement-distance graph starting at zero, decreasing to a negative minimum, increasing through zero to a positive maximum, then decreasing back to zero, completing one full cycle (starts negative).
CDisplacement-distance graph starting at zero, increasing to a positive maximum, decreasing through zero to a negative minimum, then increasing back to zero, completing one full cycle (starts positive).
DDisplacement-distance graph starting at zero, decreasing to a negative minimum, increasing through zero to a positive maximum, then decreasing back to zero, completing one full cycle (starts negative).
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of waves within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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