Is 20hz a high-frequency?

Low-frequency sounds are 500 Hz or lower while high-frequency waves are above 2000 Hz. Human ears can register sounds from about 20 Hz in frequency up to 20,000 Hz , depending of course, upon the hearer. People with hearing loss usually have trouble hearing sounds in the higher frequency range.6 Eki 2017

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What uses low frequency waves?

The Low Frequency (LF) band is mostly used for AM broadcasting in Europe as well as in areas of Northern Africa and Asia . Similar to VLF, LF can also be used for navigational radio beacons. It can also be used for maritime ship-to-shore communication, as well as transoceanic air traffic control.

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