Waves Vibrations and Oscillations
Sound Waves
How can a microphone and oscilloscope show a sound wave?
Wiki User
June 05, 2011 6:37PM
The microphone reacts to changes in air pressure and creates corresponding AC electical waveforms.
The oscilloscope takes the AC waveforms and deflects a moving electron beam in a cathode ray tube, thus producing a moving display of the electrical waveform.
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ADDED: It is measured directly and quite accurately by
sound-level meters, and these are used by environmental-monitoring
specialists etc..
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