In an experiment, a student uses a microphone and a cathode-ray oscilloscope (CRO) to analysea sound wave. The diagram shows the trace on the screen of the CRO.The student is expecting a sinusoidal waveform to be shown on the screen.Which changes should the student make to the time-base and the y-gain of the CRO so that thescreen shows a continuous trace for one complete cycle of the waveform?time-base y-gainA decrease decreaseB decrease increaseC increase decreaseD increase increase
Question
In an experiment, a student uses a microphone and a cathode-ray oscilloscope (CRO) to analysea sound wave. The diagram shows the trace on the screen of the CRO.The student is expecting a sinusoidal waveform to be shown on the screen.Which changes should the student make to the time-base and the y-gain of the CRO so that thescreen shows a continuous trace for one complete cycle of the waveform?time-base y-gainA decrease decreaseB decrease increaseC increase decreaseD increase increase
Solution
The student should increase the time-base and decrease the y-gain on the CRO. This is because increasing the time-base will stretch the waveform horizontally, allowing one complete cycle to fit on the screen. Decreasing the y-gain will reduce the vertical size of the waveform, ensuring it doesn't exceed the screen's height. Therefore, the correct answer is C: increase the time-base and decrease the y-gain.
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