Physicshard · Past Paper
What is the frequency of a sound wave whose wavelength is 1.7 cm and speed is 340 m/s?
A200 Hz
B2,000 Hz
C20,000 Hz
D200,000 Hz
✓ Correct Answer: C — 20,000 Hz
Convert wavelength to meters: 1.7 cm = 0.017 m. f = v / lambda = 340 / 0.017 = 20,000 Hz.
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