A-LevelPhysicsSuperpositionFeb/Mar 2021Paper 1 Q231 Mark
A loudspeaker emitting a sound wave of a single frequency is placed a distance L from a reflecting surface, as shown. [Figure 23.1] A stationary wave is formed with an antinode at the loudspeaker. A microphone is moved from the loudspeaker to the reflector. Before the microphone reaches the reflector, it detects four points where the sound intensity is a minimum. What is the wavelength of the sound wave?
A2L / 9
B2L / 8
C4L / 9
D4L / 8
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of superposition 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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