Ear potential that is transmitted along the spiral ganglion, which sends information through the auditory portion of the vestibulocochlear nerve to the temporal lobe of the brain. The human ear can generally hear sounds with frequencies between 20 Hz and 20 kHz (the audio range). Sounds outside this range are considered infrasound (below 20 Hz) or ultrasound (above 20 kHz) Although hearing requires an intact and functioning auditory portion of the central nervous system as well as a working ear, human deafness (extreme insensitivity to sound) most commonly occurs because of abnormalities of the inner ear, rather than in the nerves
500 kHz kHz to amateur radio use. In Belgium, amateurs are allocated a 501 to 504 kHz on a secondary basis on January 15, 2008. Only CW may be used with a maximum ERP of 5 W. In Norway, the band 493–510 kHz was allocated to radio amateurs on November 6, 2009. Only radiotelegraphy is permitted. In New Zealand, the band of 505 to 515 kHz was allocated temporarily, pending an international frequency allocation. In the Netherlands Amateur radio operators have allocated the band from 501–505 kHz with a maximum of 100 watts PEP on January 1, 2012. 500 kHz The radio