Sound: Frequency, Velocity, and Intensity in Biophysics Sound, a mechanical wave, is central to many physiological processes and medical applications in biophysics. Understanding its frequency, velocity, and intensity is crucial in areas like auditory physiology, diagnostic imaging (ultrasound), and therapeutic interventions.1. Frequency of SoundDefinition: Frequency is the number of sound wave cycles passing a point per second, measured in Hertz (Hz). Biophysical Principles: Human hearing range: 20 Hz to 20 kHz.Ultrasound: Frequencies above 20 kHz, often used