A cathode-ray oscilloscope (CRO) is used to determine the frequency of a sound wave.
The diagram shows the waveform on the screen.
The time-base setting is 5.0 ${\text{ms di}}{{\text{v}}^{ - 1}}$.
What is the best estimate of the frequency of the sound wave?

1 )
50 Hz
71 Hz
3 )
100 Hz
4 )
143 Hz
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