Sound or sound is a waveform transmitted through the vibration of a medium such as air or water (a medium that transmits physical effects), which is called a "sound wave".
People can hear sound because of air vibration, which means that it contains frequency.
The sound frequency that people can perceive is generally 16~18000Hz (18KHz), but due to individual hearing conditions and age conditions, each person's hearing range will be slightly different.
Ultrasound is a general term for sound waves with a frequency in the range of 18KHz ~ 10MHz that cannot be heard by ordinary human ears.
The frequency range of sound waves
What is frequency
Frequency is the number of times that periodic changes are completed per unit time. It is a quantity that describes the frequency of periodic motion. It is often represented by the symbol f or ν. The unit is one-second, and the symbol is s-1. In order to commemorate the contribution of the German physicist Hertz, people named the unit of frequency Hertz, abbreviated as "Hertz", and the symbol is Hz. Every object has a frequency that is determined by its nature and has nothing to do with amplitude, called natural frequency. The concept of frequency is not only applied in mechanics and acoustics, but also often used in electromagnetics, optics and radio technology.
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