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
History of broadcasting in Australia there is just a small change in format. 1920s all broadcast services allocated to a few specific frequencies, MF + LF early 1920s Class A Services low end of AM band & longwave, Class B services upper end of band, Amateurs above 1400? kHz mid 1920s AWA-influenced longwave services commenced to be switched off due to difficulties in achieving radiator efficiency late 1920s Australia commences to allocate AM radio services in the range between 1400 kHz and 1500 kHz 1926 AM restack 1930 Captain Eckersley and Radio Research Board give consideration to widespread deployment of longwave services, but eventually it