Why is ultrasonic sound used in sonar apparatus?

Ultrasonic waves are used in ultrasounds and a few other consumer products, but they are not used in Navy active SONAR operations. The higher the frequency, the lower the rage. read more

If sonic sound was used then humans will also be able to hear the sonar sound AND feel disturbed. The idea is to make sonar inaudible to humans. read more

Different sonar systems use a very wide range of sound frequencies, from very low infrasound (which may cause problems for whales and other sea creatures), through audible sound (the classic"ping" noise you hear in wartime submarines in the movies), right up to very high ultrasound (typically used in fish-location systems used by, among others, industrial trawlers). read more