What is the study and use of frequencies above 20 khz?
Ultrasonics Ultra sound Ultra-sound Ultrasonic's Ultrasound CT Biomedical ultrasonic Industrial ultrasonography Ultrasound Ultrasonic wave Ultrasounds From Sound to Image Ultrsound
industrial ultrasonography ultrasound ultra sound ultrasonics ultrasound ct from sound to image biomedical ultrasonic ultrasonic wave ultrasounds ultrasonic s ultrsound
ultrasonic s
WikipediaEntity
Ultrasonic's