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A cathode ray oscilloscope CRO is a device which convertes electrical signals into an active graphical representation on a fluorescent screen The x axis is always time axis where the 1 cm is equal to a preset time scale called time base A sound wave is displayed on the screen of a cathode ray oscilloscope The time base of the CRO is set at 2 5 millisecond per cm Voltage the frequency of the sound wave is Hz 1cm Time
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