Vibrations below 20 cycles per second (less than 20 Hz) we cannot hear, but we can feel them.
subsonic
Subsonic speed refers to speeds below the speed of sound in a medium. In water, the speed of sound is higher than in air, so typical speeds of objects moving through water are considered subsonic.
Transonic speeds are when an object is moving near the speed of sound, experiencing a mix of subsonic and supersonic airflow. Subsonic speeds are when an object is moving at speeds below the speed of sound. At transonic speeds, airflow can become unpredictable, leading to effects like shock waves and buffeting.
If accelerating to the speed of sound, the subsonic.
== Frequency speaks to the number of oscillations per unit of time. Oscillations or cycles per unit of time is a concept applied to some kind of repeating or harmonic motion or wave, and it could be mechanical (sound) or electromagnetic (light). When we consider the frequency of these oscillations, we see the frequency as the number of cycles per second that the oscillation makes. And cycles per second is what is called Hertz, after Heinrich Hertz, an early investigator. (One cycle per second is one Hertz.) A link can be found below.
Subsonic signals are sounds or vibrations that have a frequency lower than that which may be heard by the human ear as a discernable tone. Vibrations lower than 30 Hz (30 cycles per second) are considered subsonic.
The antonym for subsonic is supersonic.
Low frequency sound is usually called "infrasound" analagous to the term "infrared" for light of less than visible wavelengths. Subsonic has also been used.
Subsonic means "slower than the speed of sound" so a subsonic bullet is any bullet that travels slower than the speed of sound.
subsonic
Subsonic - media server - was created on 2005-02-10.
subsonic is lower than 20Hz, and hypersonic(aslo called ultrasonic freq.)is higher than 14000Hz-16000Hz(you cant hear ultrasonic freq.,some people hear 50-14000,some 150-16000, even some like me hear 20-16500)my specter of hearing freq.is 32-16347Hz(I have been on tests)
Supersonic
lmfao
Cuse of the manner in which sound (and, in particular, low frequency sound) is propagated unnder water, whalies, dolphins and the like as well as fieesh will be able to detect them, though it may not be "heering" as we no it. and eliphants and lions
Subsonic flow is commonly used in various engineering applications, such as in the design of aircraft wings, wind turbines, and ventilation systems. Understanding subsonic flow is crucial for optimizing the performance and efficiency of these systems.
Another term for this is infrasonic, and it means pertaining to below hearing. There natural frequencies that humans can hear which are high: 20,000 Hz and low: 20 Hz. An average human cannot hear sounds below the frequency of 20 Hz. That is subsonic. Subsonic is a term also applied to aircraft that travel at speeds less than the speed of sound. Supersonic means it travels faster than the speed of sound.