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n. one thousand periods per second

"The ground squirrels mentioned converse at 50 khz, which is only just barely outside the measured audible range of domestic dogs, for instance – so perhaps some predators in the wild can actually hear the squirrrels, as evolutionary natural selection would probably favor this ability."

rate   

MHz    ppm    db    10-mhz    mv    1-mhz    nm    megahertz    km    3-db