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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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