Question

what is Sonar how it is work

Answer 1

sonar is an instrument used in ships to locate the depth and protect it from colliding.... it send radio waves which reflects the surface and reach backs to the reciever and this reciever calculate the time of its recieval and finally interpret the depth...

Answer 2

The word SONAR stands for "Sound Navigation And Ranging." Sonar is an apparatus to find the depth of a sea or to locate underwater things like shipwrecks or enemy submarines. It uses ultrasonic waves to measure the distance, direction and speed of underwater objects.
Sonar consists of two parts:-
1) a transmitter (for emitting ultrasonic waves)
2) a receiver (for detecting ultrasonic sound transmitted by the transmitter)