Sound is applied in a variety of fields including medicine, industry, the military, and even in every day consumer electronics. Like,
One of the most important uses of sound in medicine is the ultrasound tests. These tests are non-invasive diagnostic imaging techniques which use high-frequency sound waves and a computer to create images of blood vessels, tissues, and organs.
Ultrasound is also used by many industries for a variety of applications, such as measuring the wall thickness of metal or plastic pipes. Structural engineers use ultrasound to evaluate the status of buildings and other structures after significant seismic events.
One of the main applications of sound in the military is the Sonar.