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Railways R.R.C. (Patna) Solved Paper Held on 1st_Shift 23-11-2014

  • question_answer
    Infrasonic waves are longitudinal mechanical waves having frequencies

    A) less than 20 Hz

    B) between 20 Hz to 20000 Hz

    C) more than 20000 Hz

    D) None of these

    Correct Answer: A

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