A-LevelPhysicsWaves9702/12 · May/June 2016 · 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.?
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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
A: frequency /Hz: 330, amplitude /mV: 0.6
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