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RE: Things you need to know about Sound
We can only hear the sounds that are in between 16 to 20.000 Hz. Subsonic(<16Hz) or Ultrasonic(>20.000Hz)
I actually once tested that in front of my class. It is really funny to see how those limits are actually much different (larger lower limit and smaller upper limit). Of course, there is not any reason to conclude anything from that test (not perfect conditions for the test). It is just funny :p
I had experience with pure tone audiometer in the clinic only 125Hz to 8000 Hz can be used due to the device. I have to confess that I am very curious about the subsonic and ultrsonic sounds,if life has a secret, it tells us in these frequencies:)
Maybe, or maybe the secret will just be not sonic at all ;)