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

Correct option is D

The correct answer is (d) underwater
Sonar (Sound Navigation and Ranging) is a device that uses ultrasonic waves to measure the distance, direction, and speed of objects underwater. It is widely used in submarines, ships, and for underwater exploration.

Information Booster:

• Sonar is crucial in navigation, fishing, and military applications.
• It works by emitting sound waves that bounce off objects and return to the source, allowing measurement of distance based on the time taken for the sound to travel.
• Sonar is used in submarines, ships, and even by marine biologists to map the ocean floor.

Additional Information:

• Active sonar sends out a pulse and listens for the return signal, while passive sonar listens for sounds made by objects in the water, without emitting any signal.