A-LevelPhysicsWavesFeb/Mar 2022Paper 1 Q211 Mark

A cathode-ray oscilloscope (CRO) is used to determine the frequency of a sound wave. The diagram shows the waveform on the screen. [Figure 21.1] The time-base setting is 5.0 ms div⁻¹. What is the best estimate of the frequency of the sound wave?

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

The correct answer is B: 71 Hz.

Q: What topic does this question test?

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

A50 Hz

B71 Hz

C100 Hz

D143 Hz

✓ Correct Answer

The correct answer is B: 71 Hz

📋 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 Feb/Mar 2022 examination, Paper 1 Variant 2.

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