A infrasonic sound has a frequency - under 20 kHz.
See the link below.
Longitudinal wave
Infrasound has a longer wavelength.
Humans can hear with in a range of 20 Hz - 20,000 Hz. Below 20 Hz is infrasound, and above 20,000 Hz (20 kHz) is ultrasound.
Sounds below human's lowest audible frequency of 20Hz are known as Infrasound.
The next type of seismic wave to arrive after the P-wave is the S-wave.
By examining a standing wave you can observe the frequency, wavelength, wave speed, and amplitude of the wave.
infrasound
Infrasound has a longer wavelength.
"Sound" is a mechanical wave traveling through a medium. Ultrasound is sound, but its frequency is higher than humans can hear.
Humans are able to hear infrasound, depending upon frequency and amplitude.
Range of frequency associated with infrasound is less than 20Hz.
Infrasound sometimes results naturally from 'severe weather', lee waves, avalanches, earthquakes, volcanoes, bolides, waterfalls, calving of icebergs, aurora, lightning and upper-atmospheric lightning. Nonlinear ocean wave interactions in ocean storms produce pervasive infrasound vibrations around 0.2 Hz, known as microbaroms. Infrasound can also be generated by man-made processes such as sonic booms and explosions
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i dont know im only 3