Re: SA's latest issue

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-uswest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:

> I seem to remember that the resonant frequency of Earth (I think it's
> referred to as "Shumann resonance" or something like that) is around 7.83 Hz.
> Other List members undoubtedly know more about this subject than I, so they
> may be able to clarify.

Low-frequency electromagnetic waves propagate along the surface of the 
Earth. Divide the speed of light by the average circunference of the 
Earth and you obtain a good approximation:
3e8/40e6=7.5 Hz

Antonio Carlos M. de Queiroz