explain about the ultrasonic sound dont copy from google
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An ultrasound scan is a medical test that uses high-frequency sound waves to capture live images from the inside of your body. It's also known as sonography. ... Unlike other imaging techniques, ultrasound uses no radiation. For this reason, it's the preferred method for viewing a developing fetus during pregnancy
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It's basically the sound waves with frequencies higher than the upper audible limit of human hearing ,ie 20kHz. ... Sound having frequency more than 20 KHz are called ultrasonic sound and this is inaudible to human ears.
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