what is ultra sounds?
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An ultrasound scan uses high-frequency sound waves to make an image of a person's internal body structures. Doctors commonly use ultrasound to study a developing fetus (unborn baby), a person's abdominal and pelvic organs, muscles and tendons, or their heart and blood vessels.
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If the frequency of a vibrating body exceeds 20,000 per sound it's vibration are not perceived by the human ear .Such vibration is called ultrasonic vibrations .
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