A-LevelPhysicsWavesMay/June 2021Paper 1 Q231 Mark
A sound wave is detected by a microphone that is connected to a cathode-ray oscilloscope (CRO). The screen of the CRO displays a waveform, as shown. [Figure 23.1] The time-base is set to 20 µs div⁻¹. What is the frequency of the sound wave?
A15 Hz
B15000 Hz
C20000 Hz
D30000 Hz
✓ Correct Answer
The correct answer is B. 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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