SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this purpose?

Question

Question

This question was previously asked in

NDA 02/2022 General Ability Test Official Paper (Held On 4 Sep 2022)

Answer 1

Concept:

Sonar stands for Sound Navigation and Ranging.
It is a navigation system that uses acoustic signals and is used to identify faraway things and underwater communications.
The working principle of Sonar is based on the notion of sound waves being reflected, called as echoes.
When a sound wave hits or collides with an obstruction, it reflects simultaneously. These vibrations bounce off the obstacle's face, and the Sonar receiver picks up the reflected waves.
The sound waves of frequency greater than 20 kHz are called ultrasonic waves.
These sound waves are not audible to the human ear.

Explanation:

SONAR is a device that is used to measure the distance of underwater objects by a ship. And Ultrasonic waves use for this purpose.

Additional Information

Infrasonic waves are sub-audible acoustic waves which typically lie below the human hearing threshold (usually between 0.1 to 10 Hz, sometimes going up to 20Hz). While these waves cannot be “heard” by humans.
The human ear can easily detect frequencies between 20 Hz and 20 kHz.
Hence sound waves with frequencies ranging from 20 Hz to 20 kHz is known are as audible sound.