A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2017 · Q241 Mark

A vibrating tuning fork is held above a glass cylinder filled to the top with water. The water level is steadily lowered. A loud sound is first heard when the water level is 83.5 cm above the bench. The next loud sound is heard when the water level is 17.1 cm above the bench. [Figure showing a tuning fork above a resonance tube with water, indicating water levels 83.5 cm and 17.1 cm] The speed of sound in air is 340 m s⁻¹. What is the frequency of the tuning fork?

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A128 Hz

B256 Hz

C384 Hz

D512 Hz

✓ Correct answer

B: 256 Hz

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2017 Paper 1 Variant 2, question 24.

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