Physics · Acoustics and Wave Optics
जहाज पर लगा कौन सा नौपरिवहन और पहचान उपकरण पानी के भीतर पराश्रव्य ध्वनि तरंगों (ultrasonic waves) के परावर्तन का उपयोग करके समुद्र तल की गहराई मापने या जलमग्न वस्तुओं की पहचान करने के लिए किया जाता है?
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