Sasuke and Sakura: Friends or Foes? abdominal ultrasound training of the child of 7 years 0 0 0 15 20c0 2.
984 0 0 0 19 8c2. 035 0 0 1 6 . Not to be confused with Supersonic. Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine.
In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Acoustics, the science of sound, starts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. In air at atmospheric pressure ultrasonic waves have wavelengths of 1. Children can hear some high-pitched sounds that older adults cannot hear, because in humans the upper limit pitch of hearing tends to decrease with age. Bats use ultrasounds to navigate in the darkness.