Ultrasonic refers to sound waves that have a frequency higher than the upper limit of human hearing, typically above 20,000 hertz (20 kHz). These sound waves are used in various applications, including medical imaging, cleaning delicate instruments, and pest control. In medicine, ultrasonic technology is commonly used in ultrasound imaging, which allows doctors to visualize internal organs and monitor fetal development during pregnancy. Additionally, ultrasonic cleaners use high-frequency sound waves to remove dirt and contaminants from items like jewelry and electronic components, providing a thorough cleaning without damaging delicate surfaces.