write two uses of ultrasonic sound
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Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. ... Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. Ultrasound is used in many different fields. Ultrasonic devices areused to detect objects and measure distances.
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Ultra sound is used treatement for kidney stones.
Ultrasound is used by submarines and ships to detect any large obstacle on its way such as icebergs.
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