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  1. The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

    2. A.

     Audible sounds
    B.

     Ultrasonics
    C.

     Infrasonics
    D.

     Megasonics

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    Answer : Option A

    Explanation :

    The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as audible sounds.

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