wat are the uses of ultrasonic sound?

Ultrasound refers to the sound with frequency higher than the upper limit (20 kHz) of frequencies audible to normal human ears. Its major uses are as follows:1. Ultrasound is commonly used to find flaws in materials and to measure the thickness of objects. It is a non-destructive method of testing.2. Ultrasound is used to find physical abnormalities in various parts of human body.3. A very common use of ultrasound is in sound ranging using a device called SONAR.4. Ultrasound is also used in micro welding. The weld is produced by the application of high frequency vibratory energy as the parts are held together with force.