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(C) $SONAR$ stands for $	ext{Sound Navigation and Ranging}$.It is a technique used to determine the direction, distance, and speed of underwater obje

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ultrasonic waves

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(C) $SONAR$ stands for $	ext{Sound Navigation and Ranging}$.It is a technique used to determine the direction, distance, and speed of underwater objects.$SONAR$ works on the principle of reflection of sound waves.It specifically uses ultrasonic waves (sound waves with frequencies higher than $20,000 	ext{ Hz}$) because these waves can travel through water for long distances without being scattered significantly.

In $SONAR$, we use

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