At 09:18 pm 20-01-05 -0500, Mick wrote:
MC: In the case cited, grounding of the can is irrelevant. Small AM radios
have a ferrite stick as the antenna, which responds to the magnetic portion
of the EM fields and grounding is not needed. They also have automatic gain
control circuits which try to
The Barron posted
and Merlyn replied;
I'm sorry Baron, but what!?!
shielding of a cable from frequencies higher than ULF is easily
accomplished by a metal conduit.
How would the wire sheath that the Baron suggested work?
Yes, they have engineered materials which have an effective index of
Frank,
Ground it??? I didn't know you were supposed to ground it!
8-(
[Curls up in embarrassment]
You can see why I failed Applied Electricity in my first
term at
UCL .
OK. You are indeed a specialist engineer. Essentially you
just made a better antenna for it by enlarging the near
field
I was always told that cosmic rays were primarily alpha particles ejected from the sun, but when I looked up the EM spectrum there was a notation at the high end for cosmic rays. I'm going to guess that "cosmic rays" represents general background space radiation, and therefore contains both.thomas
Actually the longer the wavelength, the greater the penetrating power. Cosmic rays penetrate because the are particles, not EM radiation. The shorter wavelengths have a stronger effect because they carry more energy.Mike Carrell [EMAIL PROTECTED] wrote:
Tom wrote again: Tom wrote: and Mike Carrel
Title: Re: ionizing radiation
Actually the longer the wavelength, the
greater the penetrating power. Cosmic rays penetrate because the
are particles, not EM radiation. The shorter wavelengths have a
stronger effect because they carry more energy.
Mike Carrell [EMAIL PROTECTED] wrote:
Are you
Title: Re: ionizing radiation
In terms of water waves, would a scalar wave be a ripple
on the surface of swell wave.
Harry
Merlyn at [EMAIL PROTECTED] wrote:
I'm sorry Baron, but what!?!
The EM spectrum is as follows:
3 - 30 Hz ELF
30 - 300 Hz ULF
3 - 30 kHz VLF
30 kHz - 30 GHz Radio
At 03:26 pm 19-01-05 -0500, you wrote:
MC: In my metaphor about regarding EM radiation as a liquid or gas getting
out of a box, that was a simple way of saying that any discontinuity in the
shielding of a Faraday cage can function as an antenna and allow some slight
radiation to escape. It takes
I put in the radio to demonstrate the Faraday Cage effect
but to my disgust the radio sounded as loud as ever. In
fact the 12x6 lid, which had folded edges soldered at the
corners, was a close fit but not air tight. Presumably the
long cracks were sufficient to allow penetration of the AM
On Tuesday, January 18, 2005, at 01:00 AM, Mike Carrell wrote:
... If this were generally true, there
would be a worldwide epidemic of brain cancer by now.
I think you will find that there is.
A few years ago the increase in brain cancers in the US (and presumably
other countries) was said to be
In a message dated 1/16/05 6:22:40 PM Pacific Standard Time, [EMAIL PROTECTED] writes:
I did a remodeling project on what once was a medical clinic. When we
cut into the walls, there were sheets of lead in them.
I am interested in stopping EMF, in particular short wave X rays and
Note that the strength of EM radiation from a cell phone is highest when it connects to the tower, at the start of a call, incoming or outgoing. I don't recall the precise numbers, but I saw the experiment on 'Mythbusters' when they were dealing with the cell phone / gas station myth.
So the
Title: Re: ionizing radiation
Meryln posted;
Note that the strength of EM radiation
from a cell phone is highest when it connects to the tower, at the
start of a call, incoming or outgoing. I don't recall the
precise numbers, but I saw the experiment on 'Mythbusters' when they
were dealing
Title: Re: ionizing radiation
I posted, and
Then the Baron weighted in:
I did a remodeling project on what once was a medical clinic. When
we
cut into the
walls, there were sheets of lead in them.
Cell phones, and high frequency waves especially those that are mixed
frequencies can
This link sums up cell phone safety issues fairly well, the results are inconclusive.
http://www.spectrum.ieee.org/publicfeature/aug00/prad.html
Spectrum is the magazine of IEEE, which is the professional association of electrical and electronics engineers.MerlynMagickal Engineer and Technical
I thought this article recently on the BBC website may
be of interest.
Grimer
===
Child warning over mobile phones
Many children use mobile phones
Parents should ensure their children use mobile phones
only when absolutely necessary
Tom wrote again:
Tom wrote:
and Mike Carrel replied
I did a remodeling project on what once was a medical clinic. When we
cut into the walls, there were sheets of lead in them.
Lead would be used to stop Xrays, nothing more.
It was a thin layer of lead, would such a layer stop
In a message dated 1/18/05 10:45:20 AM Pacific Standard Time, [EMAIL PROTECTED] writes:
I was talking to a physicist about photons.
Fiber optic cables, which carry photons, may be shielded from high energy smaller than light wavelengths such as emf's, by using negative refractive nano
Tom wrote:
I did a remodeling project on what once was a medical clinic. When we
cut into the walls, there were sheets of lead in them.
Lead would be used to stop Xrays, nothing more.
I am interested in stopping EMF, in particular short wave X rays and
possibly shorter wave EMF.
Check
At 09:00 am 17-01-05 -0500, you wrote:
Tom wrote:
I did a remodeling project on what once was a medical clinic. When we
cut into the walls, there were sheets of lead in them.
Lead would be used to stop Xrays, nothing more.
Can also be used for reducing sound transmission
which depends upon
Tom wrote:
and Mike Carrel replied
I did a remodeling project on what once was a medical clinic. When we
cut into the walls, there were sheets of lead in them.
Lead would be used to stop Xrays, nothing more.
It was a thin layer of lead, would such a layer stop short X rays too?
I am
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