Ultrasound is sound which has a frequency higher than that of audible sound.
( like radar )
ADDED: Not like radar. That uses radio waves, although sonar and radar principles are similar.
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because ultrasound is not radiation
ultrasound is used for scanning e.g. pregnant womens to check if the feotus is growing in better health
Ultrasound are usedful in diagnosing medical problems caused to human beings.
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You can see on the ultrasound sometimes