Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 20

In an experiment, a student uses a microphone and a cathode-ray oscilloscope (CRO) to analyse a 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 the screen shows a continuous trace for one complete cycle of the waveform?

1. Atime-base: decrease; y-gain: decrease
2. Btime-base: decrease; y-gain: increase
3. Ctime-base: increase; y-gain: decrease
4. Dtime-base: increase; y-gain: increase

As printed in the paper