SONAR technique is used for what purpose?

SONAR (Sound Navigation and Ranging) is a technique used to detect and locate objects underwater using sound waves.

Working principle:

• SONAR sends sound waves into water
• These waves reflect back after hitting an object
• The time taken for the echo to return is used to calculate distance

Main uses of SONAR:

• Measuring depth of the sea (echo sounding)
• Detecting submarines and underwater objects
• Finding fish shoals for fishing
• Mapping the ocean floor

Key point:

• Sound travels faster and more effectively in water than light, making SONAR highly useful underwater.