A-LevelPhysicsWavesOct/Nov 2012Paper 1 Q291 Mark
A horizontal glass tube, closed at one end, has a layer of dust laid inside it on its lower side. Sound is emitted from a loudspeaker that is placed near the open end of the tube. The frequency of the sound is varied and, at one frequency, a stationary wave is formed inside the tube so that the dust forms small heaps. The distance between four heaps of dust is 30 cm. [Figure showing glass tube with loudspeaker and dust heaps] The speed of sound in the tube is 330 ms⁻¹. What is the frequency of the sound emitted by the loudspeaker?
A1650 Hz
B2200 Hz
C3300 Hz
D6600 Hz
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The correct answer is A. This question tests the candidate's understanding of waves within the Physicssyllabus. The examiner's mark scheme requires...
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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...
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