Why is it called ultrasound?
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Ultrasound is sound that travels through soft tissue and fluids, but it bounces back, or echoes, off denser surfaces. This is how it creates an image. The term "ultrasound" refers to sound with a frequency that humans cannot hear.
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AN OBJECT OR PHYSICS ENTITY WHICH HAS A VIBRATING FREQUENCY OF MORE THAN THE AUDIBLE RANGE, THAT IS MORE THAN 20 kHz
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