[SI-LIST] Re: how EM wave propagates through space
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: "Reams, William" <William.Reams@xxxxxxxxxxxx>
- Date: Tue, 4 Oct 2011 16:09:57 -0400
The news of superluminal neutrinos have created ripples even outside the
scientific circles but there are some thoughts that it all could be a matter
of "signal integrity" indeed...
http://physicsandphysicists.blogspot.com/2011/09/dont-jump-to-conclusion-faster-than-c.html
Ihsan
On Tue, Oct 4, 2011 at 2:29 PM, Reams, William
<William.Reams@xxxxxxxxxxxx>wrote:
> Well if neutrinos really can travel faster than the speed of light then the
> answer is obvious; the universe would have to expand faster than EM waves
> propagate.
>
> http://science.slashdot.org/story/11/09/22/1841217/cern-experiment-indicates-faster-than-light-neutrinos
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Christopher.Jakubiec@xxxxxxxxxxxx
> Sent: Tuesday, October 04, 2011 12:15 PM
> To: dbrooks9@xxxxxxxxxxxxxxx; shahbaz_assad@xxxxxxxxxxx;
> si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: how EM wave propagates through space
>
> So, which travels faster the propagating EM wave or the expansion of the
> universe?
>
> Chris
> Infineon Technologies
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Doug Brooks
> Sent: Tuesday, October 04, 2011 9:45 AM
> To: S A; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: how EM wave propagates through space
>
> You might be confused by thinking about two different things (1) how it
> starts, and (2) how it continues to propagate.
>
> It does take moving charge to start an electromagnetic field. The magnetic
> field starts at an antenna, or at some point in a circuit, and radiates away
> from that point.
>
> Once it starts to radiate away (propagate), it continues in a self
> propagating manner. That is, the changing magnet field reinforces the
> electric field, the changing electric field reinforces the magnet field.
> Collectively, this is the electromagnetic field.
>
> We are used to the concept of friction, and so intuitively we don't think
> of this as continuing indefinitely. But in space, there is no "friction,'
> or resistance, or power loss, The EM field just keeps propagating forever.
> That is why we have antennas point out into space hoping to hear signal from
> outer space generated who knows how long ago!
>
> Doug Brooks
> http://www.ultracad.com
>
>
>
>
> At 02:38 AM 10/4/2011, S A wrote:
>
>
>
>
> >Hi Experts,
> >
> >My question is related to propagation of EM waves.
> >As EM waves have electric field and magnetic field and as we know that
> >electric field is due to the motion of electrons and require some
> >conducting medium.But I am confused that how EM wave propagate through
> >space. what happens to the electric and magnetic field?
> >I am sorry my question is very basic. but what happens to the electric
> >and hence magnetic field in space and how these fields exists in space.
> >
> >
> >
> >
> >
> >Thanks,
> >Shahbaz Assad
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >------------------------------------------------------------------
> >To unsubscribe from si-list:
> >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> >or to administer your membership from a web page, go to:
> >//www.freelists.org/webpage/si-list
> >
> >For help:
> >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> >List technical documents are available at:
> > http://www.si-list.net
> >
> >List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> >Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
>
> Check out our resources at http://www.ultracad.com
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
--
Ihsan Erdin
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
