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प्रश्न
What do you understand by sound signalling?
एक पंक्ति में उत्तर
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उत्तर
The process of sending ultrasonic waves in all directions to detect obstacles and hearing the echo is called sound signaling.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Sound - Graded Assignment 3.1 [पृष्ठ १८६]
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