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The fig above shows two waveforms X and Y. If the frequency of X is...

Physics
JAMB 1988
The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y
  • A. 12Hz
  • B. 19Hz
  • C. 60Hz
  • D. 75Hz
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Correct Answer: Option D
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