| http://www.w3.org/ns/prov#value | - Also, khz means kilo-hertz and hz means hertz, i.e. frequency of the sound i.e. vibrations per second (i think). sound is just a vibration of the air, and the more vibrations per second the higher the pitch of the sound. 20 khz means 20000 vibrations per second, so higher pitch. 20 hz means 20 vibrations per second, so lower pitch. hope that helps!
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