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A-LevelPhysicsWaves9702/12 · Oct/Nov 2018 · Q231 Mark

When a guitar string is plucked, it causes a longitudinal sound wave in the air, as shown. [Figure 23.1] The speed of sound in the air is 340 m s⁻¹. What is the approximate frequency of the sound wave shown?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A430 Hz

B680 Hz

C1100 Hz

D1400 Hz

✓ Correct answer

B: 680 Hz

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About this question

Topic: Waves, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2018 Paper 1 Variant 2, question 23.

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