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science forum beginner

Joined: 18 Jul 2006
Posts: 2

Posted: Wed Jul 19, 2006 4:10 pm    Post subject: Re: A simple question?

Then how to find out the "permitivity" of a real metal, such as
aluminium? I googled "permitivity reference" but only data lossless
material seem to be available.

Timo A. Nieminen wrote:
 Quote: On Wed, 18 Jul 2006, qing3000@googlemail.com wrote: I have a simple question to ask here. If I send a short electromagnetic impulse towards a infinite large thin metal plane, I should get two reflections, one for the air->metal interface and one for the metal->air interface. How to calculate the time gap of the two reflections? Basically the same way you would for any non-perfectly conducting conductor. "Lossy dielectric" = "conductor". It is metal, so it doesn't have dielectric property for velocity calculation. Yes it does, if it's a real metal. If you're assuming it's a perfect electrical conductor, then there won't be a second reflection, it'll be a perfect mirror and everything will be reflected at the first interface. -- Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/ E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
Timo Nieminen
science forum Guru Wannabe

Joined: 12 May 2005
Posts: 244

Posted: Tue Jul 18, 2006 8:35 pm    Post subject: Re: A simple question?

On Wed, 18 Jul 2006, qing3000@googlemail.com wrote:

 Quote: I have a simple question to ask here. If I send a short electromagnetic impulse towards a infinite large thin metal plane, I should get two reflections, one for the air->metal interface and one for the metal->air interface. How to calculate the time gap of the two reflections?

Basically the same way you would for any non-perfectly conducting
conductor. "Lossy dielectric" = "conductor".

 Quote: It is metal, so it doesn't have dielectric property for velocity calculation.

Yes it does, if it's a real metal. If you're assuming it's a perfect
electrical conductor, then there won't be a second reflection, it'll be a
perfect mirror and everything will be reflected at the first interface.

--
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
science forum beginner

Joined: 18 Jul 2006
Posts: 2

 Posted: Tue Jul 18, 2006 2:31 pm    Post subject: A simple question? I have a simple question to ask here. If I send a short electromagnetic impulse towards a infinite large thin metal plane, I should get two reflections, one for the air->metal interface and one for the metal->air interface. How to calculate the time gap of the two reflections? It is metal, so it doesn't have dielectric property for velocity calculation. Any help or pointing appreciated! Qing

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