A microphone is connected to a cathode-ray oscilloscope (CRO). The diagram shows the waveform on the display of the CRO when the microphone detects a sound.
A.
B.
C.
D.
Exam No：9702_s25_qp_14 Year：2025 Question No：20
Answer:
B
Knowledge points:
7.1.1 describe what is meant by wave motion as illustrated by vibration in ropes, springs and ripple tanks
7.1.2 understand and use the terms displacement, amplitude, phase difference, period, frequency, wavelength and speed
7.1.3 deduce, from the definitions of speed, frequency and wavelength, the wave equation v = fm d) recall and use the equation v = fm
7.1.4 recall and use the equation v = fm
7.1.5 recall and use the relationship intensity ∝ (amplitude)2
Solution:
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