정의: Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.
| 핵심 연구 분야 | Analysis |
|---|---|
| 주요 연도 | 2021년 |
| 주요 연관 키워드 | smartphone |
| 좋아요 수 | 0 |