A-LevelPhysicsWavesMay/June 2017Paper 1 Q241 Mark
A bicycle gear wheel is a disc with 50 'teeth' equally spaced around its edge, as shown. The gear wheel is rotated 10 times each second. A springy strip of metal is vibrated by the rotating 'teeth'. The metal strip produces a sound of frequency that is equal to the frequency of vibration of the strip. [Figure shows a gear wheel with 50 teeth, rotating. A springy strip of metal is held by a fixed clamp and touches the teeth of the gear wheel.] The speed of sound in air is 330 ms⁻¹. What is the wavelength of the emitted sound?
A0.66 m
B1.5 m
C6.6 m
D500 m
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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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