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Q: A source of wave produces 20 crests and 20 troughs in 0.4 seconds. Find the frequency of the wave :
  • A. 10 Hz
  • B. 510 Hz
  • C. 80 Hz
  • D. 50 Hz
Correct Answer: Option D - Number of vibration generated by the source of sound in 0.4 seconds = 20 Wave frequency (f) = vibration per second = 20 / 0.4 = 50 Hz
D. Number of vibration generated by the source of sound in 0.4 seconds = 20 Wave frequency (f) = vibration per second = 20 / 0.4 = 50 Hz

Explanations:

Number of vibration generated by the source of sound in 0.4 seconds = 20 Wave frequency (f) = vibration per second = 20 / 0.4 = 50 Hz