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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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