A sound wave travelling at a speed of 330 m/s produces 20 crests and 20 troughs in 0.1 second. The wavelength of the sound wave is:
- A. 1.1 m
- B. 3.3 m
- C. 1.65 m ✓
- D. 2.2 m
Correct Answer: C. 1.65 m
Explanation
20 crests and 20 troughs correspond to 20 full cycles. Frequency f = 20 / 0.1 = 200 Hz. Wavelength \lambda = v / f = 330 / 200 = 1.65 m.
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