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  1. The frequency of ultrasound wave is typically

    2. A.

     Above 20 kHz
    B.

     Above 20,000 kHz
    C.

     Below 20 kHz
    D.

     Below 02 kHz

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    Answer : Option C

    Explanation :

    Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz. In general, humans can hear sounds with a frequency between 20 Hz and 20 kHz.

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