A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2019 · Q241 Mark
A straight tube is closed at one end and has a loudspeaker positioned at the open end. The frequency of the loudspeaker is initially very low and is increased slowly. A series of loudness maxima are heard. The stationary wave which gives the first maximum has a node at the closed end and an antinode at the open end. The frequency of the loudspeaker is f₁ when the first maximum is heard. What is the frequency of the loudspeaker when the fourth maximum is heard?
A⁷f₁ / ₄
B2f₁
C4f₁
D7f₁
✓ Correct answer
D: 7f₁
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