Name the Device used for locating submerged objects under the
VerifiedAnswer: Sea. SONAR
Explanation:
SONAR (Sound Navigation and Ranging) is a highly effective device used for detecting and locating submerged objects in water bodies like seas, oceans, and lakes. This technology has revolutionized underwater exploration and navigation, making it possible to map ocean floors, locate shipwrecks, and detect submarines.
The working principle of SONAR is based on sound wave reflection. The device emits high-frequency sound waves (ultrasonic waves) into the water. When these sound waves encounter any underwater object like a submarine, fish, rock, or the sea floor, they bounce back to the source. The SONAR system then detects these reflected waves, also called echoes.
By measuring the time taken for the sound waves to travel to the object and return, SONAR can calculate the distance of the submerged object. The formula used is: Distance = (Speed of sound in water × Time taken) ÷ 2. We divide by 2 because the sound wave travels to the object and back, covering twice the actual distance.
SONAR systems have numerous practical applications in marine activities:
• Navigation and safety for ships and boats
• Military applications for detecting enemy submarines
• Fishing industry to locate schools of fish
• Underwater archaeology to discover shipwrecks
• Ocean mapping and depth measurement
• Search and rescue operations
There are two main types of SONAR systems: Active SONAR and Passive SONAR. Active SONAR emits sound waves and listens for echoes, while Passive SONAR only listens for sounds made by other objects without emitting any signals itself.
The development of SONAR technology has been crucial for maritime safety and exploration, allowing humans to "see" underwater even in complete darkness where light cannot penetrate. This makes SONAR an indispensable tool for understanding and navigating the mysterious depths of our oceans.
