Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
-----Original Message-----wave
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Jack Uretsky
Sent: Friday, November 30, 2007 11:24 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] EM, is it energy
It is easy to get lost in meaningless jumbles of wards, like, "if a
is flowing in empty space." Think of an experiment - even anidealized
one. For example, consider an an isolated antenna, and an e-m waveAsk
incident on the antenna. Now ask about the forces on the antenna.
about the energy imparted to the antenna, and how you would measurethat
energy."abstract
Regards,
Jack
On Fri, 30 Nov 2007, carmelo@pacific.net.sg wrote:
Quoting "LaMontagne, Bob" <RLAMONT@providence.edu>:"forces"
?? If the wave is traveling through empty space, what are these
Oopsacting upon? Do you mean fields?
Wave is energy? Guess it depends on what the definition of "is" is!
- I guess this is more appropriate for the PHYSOC list
Bob at PC
This was quoted from BBC News: (Not my idea!)
http://news.bbc.co.uk/1/hi/sci/tech/1702259.stm
Ironically, many physicists prefer to consider energy as an
ifconcept", yet explain the flow of energy through Poynting vector as
ofit is a material being. Poynting Vector gives the direction of flow
"abstract concept"?
Alphonsus
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
--
"Trust me. I have a lot of experience at this."
General Custer's unremembered message to his men,
just before leading them into the Little Big Horn Valley
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l