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  1. Infrasonic sound has a frequency lower than

  2. A.

     5 Hz

    B.

     15 Hz

    C.

     20 Hz

    D.

     32 Hz

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    Answer : Option C

    Explanation :

    Infrasonic Sound has a frequency less than the audible frequency range. Frequencies are less than 20 Hz. The infrasonic sounds have below the lower limit of human hearing.


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