An ultrasonics is the branch of physics that deals with the propagation and detection of ultrasonic waves. Those kind of waves have frequencies more than 20,000 Hz .
Normally , human beings are not audible to ultrsonics waves. They can only be heard by animals and birds. That's why, animals and birds are more likely to detect the change in nature such as earthquake, tsunami, volcanic eruption etc, before human beings could even notice. For examples, bats and dolphins can produce and detect the ultrasonic waves . They uses this ability to communicate or for catching prey .
Ultrasonics waves can be reflected, refracted, and absorbed like and ordinary sound waves.These waves are used to measure the depth of the sea. On the medical scope, ultrasonic waves are used for neuro patient. Also they are used for locating the position of the eye tumour.
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