Infra Sound vs Ultra Sound

• The human ear is exposed to a significant amount of various sounds and noises on a daily basis, over a wide spectral range extending beyond the frequency limits of human hearing defined between 20 Hz and 20 kHz.
• The frequencies  below 20Hz are called Infrared sounds and the frequencies above 20KHz are called Ultra sounds.

 Infrared Sound vs Ultra Sound:

INFRASOUND	ULTRASOUND
Infrasound refers to the sound with frequnecy lowerthan 20Hz which cant be heard by humans.	Ultrasound refers to the sound with frequncy higher than the upper limit (20KHz) of frequencies audible to normal human ears.
Infrasound is used to stabilize myopia in young kids.	Ultrasound is commonly used to find flaws in materials to measure the thickness of objects, to find physical abnormalities in various parts of human body, as well as in the form of a sound ranging device called SONAR.
Infrasound is influenced by the atmosphere so it can be used to monitor the activities of the atmosphere.	Ultrasound is not influenced by any such factors.
In particular, natural disasters such as volcanic eruptions, earthquakes etc can be forecasted by monitoring the infrasonic waves.	In particular, ultrasound is also used in micro welding. The weld is produced by the application of high frequency vibratory energy as the parts are held together with force.

 Sources of Infrared Sounds:

Infrared Sounds generated by Natural Events

Human Made Infrasounds

 Sources of Ultrasounds:

Ultrasounds Produced from Variety of Industrial Processes