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Ground Or Not To Ground Receiving Antenna In Storm ?

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December 19th 05, 03:03 AM posted to rec.radio.amateur.antenna

Amos Keag

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Ground Or Not To Ground Receiving Antenna In Storm ?

Russ wrote:
On 18 Dec 2005 08:41:47 -0800, wrote:

I do believe that any mechanical wave, such as a pressure or shock
wave,
travels at the speed of sound, no more and no less. To travel faster,
it
would have to be an electromagnetic wave.

Also, the deaf person wouldn't hear the mechanical wave. Well,
unless they had "some" hearing still available. If it was proven that
a totally deaf person could hear it, that would pretty much nail it
down as
electromagnetic. If that came out to be true, then Coffmans theory
about the auditory nerve picking it up would probably be true unless
some other nerve was actually involved.
MK

Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

R

Also, the pressure wave INSIDE a rifle barrel travels faster than the
speed of sound. It produces velocities of the projectiles at Mach 3 to
Mach 4. Hmmm...

The air pressure profile on an aircraft wing shows supersonic, transonic
and subsonic reponses. Hmmm..

It raises a physics question. How does the velocity of sound vary in a
compressible medium as the temperature, volume and pressure change?

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