Table of Hertz Frequencies and Applications Frequency Range Application 0-20 Hz Infrasound, used in seismology and for studying animal communication 20-20,000 Hz Audible sound for human hearing 30,000-300,000 Hz Ultrasound, used in medical imaging and industrial cleaning 3-30 kHz Very Low Frequency (VLF), used in navigation and time signal broadcasting 30-300 kHz Low Frequency (LF), … Read more