Question

what is SONAR?Explain the principle of working

Answer 1

Sonar is an instrument which is used to measure electric current
Principle: It uses the phenomenon of echoes in determining the sea-depth and locating the presence of under-water objects.
Working:

i) A strong beam of ultrasonic waves is sent from a transmitter mounted on the ship.

ii) The beam is reflected from the seabed and is received by an under-water detector which is also mounted on the ship.

iii) The time interval between transmission and reception of the ultrasonic signal is noted.