Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 24
A sound wave is displayed on the screen of a cathode-ray oscilloscope (CRO) as shown. The time-base of the CRO is set at 2.5 ms cm⁻¹. What is the frequency of the sound wave?
- A50 Hz
- B100 Hz
- C200 Hz
- D400 Hz
As printed in the paper
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Correct answer: B. 100 Hz
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