A-LevelPhysicsWavesMay/June 2016Paper 1 Q221 Mark
A microphone connected to the Y-plates of a cathode-ray oscilloscope (c.r.o.) is placed in front of a loudspeaker. The trace on the screen of the c.r.o. is shown. [Figure 22.1] The time-base setting is 0.5ms cm⁻¹ and the Y-plate sensitivity is 0.2mV cm⁻¹. What is the frequency of the sound from the loudspeaker and what is the amplitude of the trace on the c.r.o.?
Afrequency /Hz: 330, amplitude /mV: 0.6
Bfrequency /Hz: 330, amplitude /mV: 1.2
Cfrequency /Hz: 670, amplitude /mV: 0.6
Dfrequency /Hz: 670, amplitude /mV: 1.2
✓ Correct Answer
The correct answer is A: frequency /Hz: 330, amplitude /mV: 0.6
📋 Examiner Report & Trap Analysis
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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep