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?
Infrasonic waves
Sound waves in audible range for human beings
Ultrasonic waves
All of the above
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-2 – 2022
– The speed of sound in water is known, so the distance can be calculated from the travel time.
– Ultrasonic waves (frequencies above the human hearing range, typically >20 kHz) are preferred in SONAR for several reasons, including better directionality, less attenuation over typical ranges compared to higher frequencies, and superior resolution compared to lower (infrasonic or audible) frequencies for object detection.