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Yes. If you were to slow to subsonic speeds, the boom can catch up to you, and you would hear it.
With an effective sound suppressor and subsonic ammunition, the only sound you hear is the slide moving.
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)
Whales navigate with subsonic vibrations. like sonar
The antonym for subsonic is supersonic.
Vibrations below 20 cycles per second (less than 20 Hz) we cannot hear, but we can feel them.
Subsonic means "slower than the speed of sound" so a subsonic bullet is any bullet that travels slower than the speed of sound.
Subsonic - media server - was created on 2005-02-10.
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.
Sound is a vibration (wave) transmitted through the atmosphere. It does not need to be perceived by an ear to exist. Without air--as in space--no one can hear you scream. That's catchy! Subsonic vibrations, such as an earthquake, can be felt by the body, but if you hear it, then the vibration is being transfered through the air.
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