Recent content by andonrangelov

Can someone give a proof of the statement: “For fix volume a 3-D objects that has minimal surface area is the sphere” ?

Abel, thanks for your comments. I am interested in those equations because they appear in different physical phenomena like three state quantum system, Lorentz force and many more… Normally there is a contraintuitive solution for those equations and I want to see what will be the result in...

The mirror itself serve as a half-wave plate if your light fall perpendicular to its surface. Light that pass two times through the quarter wave plate serves as a half wave plate.

No, you need quarter wave plate and a polarizer. This is called circular polarizer (see http://en.wikipedia.org/wiki/Circular_polarizer#Circular_Polarizers)...

This is the way to build a zero order wave plate, so you may have a half-wave plate or a zero order quarter wave plate. Zero order wave plate has better properties then the wave plate. Bye the way very good question and very proper time to ask it Aug2-11

Robphippen very good question I was going to ask the same question, so thank you for asking instead of me …

The plate will have the same charge but opposite sign. For more details see the Method of images (for example here http://en.wikipedia.org/wiki/Method_of_images)... Of course this is if you assume that the metal plate is infinity big (the charge is close to the plate surface) Sorry better...

Nonlinear differential equation can, what are the solutions of this one? Hi all, I am searching for the solutions of the following nonlinear system: idA/dt=B.B.exp(i.s.t) idB/dt=B*.A.exp(-i.s.t) where B(t),A(t),s=constant but B and A are complex (B* means complex conjugation of B...

Thank you very much for those examples, but with quantum mechanics I am not familiar. I just want to have more detail example, it can be in optics or other more easy understanding fields then quantum mechanics. For example a link or a good book recommendation will serve best. Thanks again….

Ok, here is the nonlinear system that I want to solve idA/dt=B.B.exp(i.s.t) idB/dt=B*.A.exp(-i.s.t) where B(t),A(t),s=constant but B and A are complex (B* means complex conjugation of B in the above equation)

I start to learn about matrices and their algebra, but I am wondering what physical application they have. I know that matrices have application in optics, which is called “Matrix Optics”, but do they have other applications? Can you give different and real physical examples with matrix algebra...

SteamKing you are right I haven’t pay enough attention here is the problem set and the solution if someone is interested in it, about the point of the parabola I think the others give good explanation how to find it….

Well it seems that my question is very difficult …..

Here is a new development about the invisibility http://www.kurzweilai.net/physicists-use-natural-crystals-to-develop-invisibility-cloak or if you like you may look directly to the paper http://www.nature.com/ncomms/journal/v2/n2/pdf/ncomms1176.pdf

Does someone know other applications, or where this formulas may appear?