A-LevelPhysicsWavesMay/June 2019Paper 1 Q231 Mark

The diagram illustrates the position of particles in a progressive sound wave at one instant in time. [Figure 23.1] The speed of the wave is v. P and Q are two points in the wave a distance L apart. What is an expression for the frequency of the wave?

Q: What is the correct answer to this A-Level Physics question?

The correct answer is A: v / (2L).

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Av / (2L)

Bv / L

C2v / L

DL / v

✓ Correct Answer

The correct answer is A: v / (2L)

📋 Examiner Report & Trap Analysis

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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Physics Question

Topic

This multiple-choice question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics May/June 2019 examination, Paper 1 Variant 2.

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