Ultrasonic waves are produced by making use of पराश्रव्य तरंगें उत्पन्न करने के लिए किसे प्रयुक्त किया जाता है?

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Ultrasonic waves are produced by making use of पराश्रव्य तरंगें उत्पन्न करने के लिए किसे प्रयुक्त किया जाता है?