People's ears acceptable to sound range from 16 to 20,000 Hertz. When the sound of frequency reached 25 to 8,200 Hertz, can feel the vibration. Less than 16 hz voice called bass, higher than 20,000 Hertz for ultrasonic. More than 20 years ago, scientists began to earnest study voice to the influence of human body, the results showed that the ultrasonic to internal organs of harmful effects.
Elastic joints and Electric Guitar hand fingers damage
Originally, long-term exposure to more than 20,000 Hertz voice effect, can cause human body organization a slight fever. When frequency high to ultrasonic or higher, fever rapidly. The results, the body of water molecules are burned, the surrounding tissue destruction. Ultrasonic if not controlled more dangerous, can cause excessive blood, inflammation and Arthritis.
High frequency instrument, such as electric guitar, in performing sent lot of ultrasonic. So, a musician's hand joints and finger damage. Because have clothes, the body suffers smaller. Sometimes the electric guitar on bending the knees, also can affect the knee.
The high strength of high-power ultrasonic continuing role in human tissue is harmful. Small power ultrasound in intermittent role in human tissue is very beneficial. Ultrasonic is a kind of vibration wave. Tell a popular example, when someone gives you gently beat back you comfortable, but when you feel pain crit, you even damage.
The following originates from the network reference
No harm to people, ultrasonic there is profit.
Actually acoustic belongs to the category of voice, belong to wave, sound waves refers to the human ear can feel a kind of wave, the frequency range for 16Hz - 20KHz. When sound waves of frequency 16Hz when he called below 20KHz is called device, higher than the ultrasonic sound wave.
Ultrasonic has the following features:
1) ultrasonic available in gas, liquid and solid, solid melts in the media such as efficient human-to-human transmission.
2) ultrasonic can transfer strong energy.
3) ultrasonic produces reflection, interference, stacked and resonance phenomenon.
4) ultrasonic in liquid medium transmission, the screen produces strong impact and the cavitation phenomenon.
Ultrasonic sound is a member of the family.
Sound waves are objects mechanical vibration condition (or energy) form of transmission of. So-called vibration refers to material of particles in its balance position near the round-trip movement. For example, reaches the knock that it up and down, the vibration state vibration through the air medium in all directions, this would be sound waves spread.
Ultrasonic vibration frequency than 20KHz refers to the above, the person is in natural environment to hear and feel of the sound wave.
Ultrasonic treatment concept:
Ultrasound treatment learning is an important part of ultrasonography. Ultrasound treatment will ultrasonic energy function in the human body the lesion site, in order to achieve treat diseases and stimulative airframe rehabilitation purpose.
Around the world, ultrasonic diagnostics, widely used in the treatment of science, engineering, Biology, etc. The composer household ultrasonic constrution belongs to the ultrasonic therapeudic use category.
(a) in engineering application: underwater positioning and communications, underground resources exploration, etc
(2) biological applications: shear macromolecules, bioengineering and handle seed, etc
(3) diagnostics applications: type A, type B, type, type D, M type double function, and sufficiency, etc
(4) therapeutic applications: physical, cancer, surgery, in vitro gravel, dental, etc
Ultrasonic features:
1, ultrasonic in spreading, directional, strong energy to concentrate.
2, ultrasonic can spread in different medium, and can spread far enough distance.
3, ultrasonic and sound transmission medium interaction moderate, easy for carrying about sound transmission medium state information (diagnosis or sound transmission medium to produce effect (treatment).
Ultrasonic is a kind of wave form, it can be used as a detection and load information carrier or medium (such as type-b ultrasonic diagnosis); used as Ultrasonic also an energy form, when its strength over a certain value, it can be spread through the medium of ultrasonic and interaction, to influence the result that break the latter, change of state, nature and structure (as a treatment for).
Ultrasonic history:
A, international aspects:
Since the late 19th and early 20th centuries, in the physics discovered on the piezoelectric effect and reverse piezoelectric effect later, people solved the use of electronics technology producing ultrasonic method, from now on rapid development and promotion unveiled the ultrasonic technology history chapter.
yes
sound is measured in decibles
The same way you record normal sound. infra sound is the same as normal sound but our ears cannot hear it. a microphone would.
It depends very much on the sound pressure level the sound makes at the ears. Adults can often not hear sine tones higher than 15 kilohertz.
by 200 decibels the bones that vibrates to form sound can not withstand the sound and blast directly into the brain causing the person to die immediately If that doesn't happen after a few seconds of such high noise frequencies the brain will become unable to withstand the intense vibrations and actually explode literally it will not cause the cranium (skull) to automatically blow to bits but the brain is ultra sensitive so it would just burst and the blood would eventually leak out the ears. Maybe... But the loudest tone possible is only 192 decibels.
Your jaw bones. Then up through the anvils and stirrups to your eardrums.
ears mouth and throat scan
Loud sounds can be harmful as it damages the ears and the brain.
The same way we do - by using their ears ! Bats use ultra-sonic sound which is higher than the range humans can hear - their 'squeaks' bounce off objects, and prey and are reflected back to the bat so it can navigate in total darkness.
A sonic boom
Ultrasound is sound we can not hear. Our ears can detect vibrations between 20-20,000 hertz (vibrations per second); anything outside this range is still physically a sound, but we simply can't detect it.
No the chao gets sonic hair.
tails
Supersonic waves are created when something surpasses the speed of sound, which ranges from 330-350 meters per second (depending on the temperature of the media, etc.) and the loud crack is called a sonic boom. The sonic boom isn't necessarily at the same time that the object breaks the barrier but when the sound wave reaches ones ears. Many sonic booms can be heard from miles away.
We generally refer to the sound we hear when a supersonic object passes somewhere in our vicinity as a sonic boom.+++A sonic boom is the shock-wave created by an aircraft accelerating past the speed of sound breaking through a pressure-wave formed in the slip-stream around the aircraft's nose.
No, pig ears are a good chewing treat for dogs.
In our ears the sound vibrates and makes the sound
because is dark in the sea, so the dolphins can't see. the dolphins use ultra sound to navigate and to hunt for pray, like a bat does.