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Q: A sound wave produced 40 crests and 40 troughs in 0.3 seconds. Find the frequency of the wave.
  • A. 120.40 Hz
  • B. 300 Hz
  • C. 133.33 Hz
  • D. 100 Hz
Correct Answer: Option C - The number of vibrations performed by a particle in one second is called frequency. Wave frequency = 40 / 0.3 = 400/3 = 133.33Hz
C. The number of vibrations performed by a particle in one second is called frequency. Wave frequency = 40 / 0.3 = 400/3 = 133.33Hz

Explanations:

The number of vibrations performed by a particle in one second is called frequency. Wave frequency = 40 / 0.3 = 400/3 = 133.33Hz