Question

What is $SONAR$? Explain its working.

Answer 1

$SONAR-$The acronym $SONAR$ standa for Sound Navigation and Ranging.

Sonar is a device that uses ultrasonic waves to measure the distance,direction and speed of underwater objects.

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.