Which of the following is an example of a non acoustic system?

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Multiple Choice

Which of the following is an example of a non acoustic system?

Explanation:
Non-acoustic systems do not rely on sound waves to detect or sense; they use other energy forms. A magnetic anomaly detector uses a magnetometer to sense disturbances in the Earth's magnetic field caused by a submarine’s ferrous hull as it moves. Because it detects magnetic field changes rather than emitting or listening for sound, it clearly fits the non-acoustic category. Radar, navigation, and electronic countermeasures operate with electromagnetic signals or other navigation methods, but MAD is the classic example of a non-acoustic sensing approach.

Non-acoustic systems do not rely on sound waves to detect or sense; they use other energy forms. A magnetic anomaly detector uses a magnetometer to sense disturbances in the Earth's magnetic field caused by a submarine’s ferrous hull as it moves. Because it detects magnetic field changes rather than emitting or listening for sound, it clearly fits the non-acoustic category. Radar, navigation, and electronic countermeasures operate with electromagnetic signals or other navigation methods, but MAD is the classic example of a non-acoustic sensing approach.

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