Ultrasound wave is like the ordinary sound wave. If its intensity is controlled within the safty range, it will not pose threat to people’s health.
Ultrasound wave is the sound wave whose vibration frequencies exceed 20KHz and human beings cannot hear or feel it in the natural environment.
The human ear can receive the sound range from 16 to 20,000 Hertz. When the sound frequency reaches 25-8200 Hz, people can feel the vibration. If the sound is below 16 Hz, we call it bass; If it is higher than 20,000 Hz, it is ultrasound. Twenty years ago, scientists began to seriously study the impact of sound on the human body, and found that the harmful effects of ultrasound on the internal organs.
The truth is that if that slight fever will be caused if the human body tissue is exposed to the sound that exceeds 20000 KHz for a long time. The fever will be worse if the frequency reaches the ultrasound level or higher. It is found that the inner body water molecules will burn and the nearby tissue will be destructed. The ultrasound, if not controlled well, will be more dangerous and cause
haemorrhagic, inflammation and arthritis.
High-frequency instruments such as electric guitar, issue a large number of ultrasound at the time of playing. Thus, the knuckles and fingers of the musicians will be hurt. But because of the protection of the clothes, the body will suffere only minor damage. Sometimes if the electric guitar is put on the bent knees, it can also affect the knees.
High-intensity ultrasound power will be harmful to human tissue if the exposure is sustained. Low-power ultrasonic is good to human body if in an intermittent way.
Ultrasound is a mechanical vibration wave. For example, if someone pounds your back gently like in a massage, you will feel comfortable, but if he hits you, you will feel painful or get injured.
