Ultrasound is sound with a frequency higher than the upper limit of human hearing. It can be directed inside an object and the reflected waves analyzed to produce an image. The most well known application of this technique is its use in sonography to produce pictures of fetuses in the human womb.
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There are many type of way ultrasound can be used.
If you are refering to physical science ultrasound are:sound waves with Frequencies above 20,000hz(hertz)