Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 23
A sound wave is detected by a microphone. The output from the microphone is connected to the Y-input of a cathode-ray oscilloscope (c.r.o.). The trace on the c.r.o. is shown. The time-base is set at 0.20 ms per division. What is the frequency of the sound wave?
- A1000 Hz
- B1250 Hz
- C2000 Hz
- D2500 Hz
As printed in the paper
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Correct answer: B. 1250 Hz
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