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      Question

      Sounds of frequencies less than about ______ vibrations

      per second cannot be detected by the human ear.
      A 40 Correct Answer Incorrect Answer
      B 35 Correct Answer Incorrect Answer
      C 20 Correct Answer Incorrect Answer
      D 50 Correct Answer Incorrect Answer

      Solution

      Human ear can not detect sound less than 20 vibration per second or above than 20000 vibration per second.

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