There are infinite number of octaves below 20Hz.
20, 20/2, 20/2/2, 20/2/2/2,... i.e.
20, 10, 10/2, 10/4, 10/8, 10/16, ...
Whereas in electromagnetic waves the energy of a photon is proportional to frequency, in acoustic and mechanical vibration waves the penetrating energy is increasing as the frequency is lowered. A10Hz wave with its large wavelength can penetrate easily many walls as you can hear if you live near a night club, or near a railway.
Low frequency and sub audio vibration waves from motors, (fridge, air conditioning, vibration of air ducts coupled to buildings) travel and hug easily a whole building as the wavelength is very large. It is possible that this dramatically affects how people feel if the time exposure is high. The time exposure is usually very high until one decides to move to a new house environment. But your frequency is so lowered by that time, it takes great effort to get away.
A great help can be someone with charisma near you and the great book Fringe Knowledge for Beginners by Montalk (www.montalk.net), or the master fairytale The Little Price by Exupery.. The great tool is aphobia as fear does not exist.
At sub audio frequencies the wavelength becomes huge according to
wavelength = speed of waves in medium / frequency of wave
There seems to be an inverse analogy with photons. There may be a packet of energy, let's call it acouston whose energy is proportional to how low the frequency is.
energy of an acouston = constant x wavelenth
energy of a photon = h x frequency (h: Planck's constant)
Additional notes:
At frequency tending to 0Hz the wavelength tends to infinity and (time) period tends to infinite.
This is our universe, its size and the time it evolves.
Gravity may be a wave of frequency tending to 0Hz.
a great reference for acoustics and structure born travel of sound vibration waves:
Acoustics for radio and television studios, Christopher Gilford
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