In SONAR, we use (1) ultrasonic waves (2) infrasonic waves (3) radio waves (4) audible sound waves

A common use of ultrasound is in SONAR. Ultrasonic waves are used in SONAR instead of audible sound waves. The correct option is (1) ultrasonic waves.

SONAR uses ultrasonic waves i.e. sounds having frequency greater than 20,000 Hz. The ultraviolet radiations are not scattered or deviated much.

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