Physics (AS & A Level) · May / June 2021 · Paper 13 · Question 24
A microphone is connected to a cathode-ray oscilloscope (CRO). A sound wave of constant frequency is detected by the microphone. The screen of the CRO is shown. The time-base is set at 1.0 ms cm⁻¹. What is the frequency of the sound wave?
- A250 Hz
- B500 Hz
- C670 Hz
- D4000 Hz
As printed in the paper
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Correct answer: A. 250 Hz
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