Oscilloscope displaying sound wave signal, illustration
Oscilloscope and tuning fork, illustration. Striking a tuning fork produces a sound, which propagates as a longitudinal wave. The sound wave encounters the microphone, which converts it into an electrical signal displayed on the oscilloscope screen as a sinusoidal waveform. The amplitude indicates the loudness of the sound, and the frequency is the pitch., by SCIENCE PHOTO LIBRARY
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