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Explain uses of ultrasonic sound.

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The uses of ultrasonic sounds are:
1. They are used in medical field for diagnosis and treatment of internal illnesses of the human body.
2. Using ultrasound, kidney stones can be broken into small grains which later on get flushed out through the urine.
3. Ultrasonography is used to examine the foetus during pregnancy.
4. Ultrasound is also used in heart checks (ECG).
5. Industrially, ultrasonic sounds are useful in examining metals for defects like cracks etc. and for cleaning machine parts.
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