Which technology is Active acoustic used to detect submerged U-boats?

Which technology is Active acoustic used to detect submerged U-boats?

• A. Radar
• B. Sonar (ASDIC)
• C. LIDAR
• D. Enigma

Answer: (B)

Active acoustic detection works by sending out a sound pulse through the water and listening for echoes from a submerged object. The time it takes for echoes to return helps determine distance, and the pattern of received signals helps locate the target’s direction. In World War II, the primary method for finding submerged U-boats was sonar, with the Royal Navy using the ASDIC system as their active sonar platform. Radar relies on radio waves and is effective mainly for surface targets and aircraft, not submerged vessels. LIDAR uses light, which is rapidly attenuated in water and cannot detect submarines underwater. Enigma is an encryption device, not a sensing technology. So the technology that fits active acoustics for detecting submerged U-boats is sonar, specifically ASDIC in that era.

Active acoustic detection works by sending out a sound pulse through the water and listening for echoes from a submerged object. The time it takes for echoes to return helps determine distance, and the pattern of received signals helps locate the target’s direction. In World War II, the primary method for finding submerged U-boats was sonar, with the Royal Navy using the ASDIC system as their active sonar platform.

Radar relies on radio waves and is effective mainly for surface targets and aircraft, not submerged vessels. LIDAR uses light, which is rapidly attenuated in water and cannot detect submarines underwater. Enigma is an encryption device, not a sensing technology. So the technology that fits active acoustics for detecting submerged U-boats is sonar, specifically ASDIC in that era.