Recent content by manofphysics

Breit Frame of reference ("Brick Wall") I am having a lot of trouble understanding breit frame of reference.I was trying to solve griffiths problem 3.21 (1st ed.): Consider elastic scattering- A+B----->A+B If particle A carries energy E, and scatters at an angle theta in the CM, a) what is...

Thanks a lot, born2bwire...I really appreciate your help.It may sound funny but this was one thing which I had not understood for a long time even while using it for solving many problems.

I have understood the point, born2bwire. But in Griffiths, he empathically says that bound charges are true accumulations of charges and not imaginary equivalent charges or mathematical tools to facilitate calculation.

Ok, if volume remains approx. constant and P increases, then as higher electric field is applied surface charge of the conductor = P.n also increases?How can that be, as charges at the surface are constant as shown in the figure( attached it in my first post).

I know that distance of dipole increases as applied electric field increases and hence dipole moment increases. But \overline{P} is dipole moment per unit volume.And that should remain constant as volume also increases as dipole moment increases.

Consider a uniform, isotropic , homogeneous solid dielectric slab. We know, induced surface charge=\overline{P}.\widehat{n} and \overline{P} \alpha \overline{E} So, as applied electric field increases, polarization per unit volume increases. which implies that surface...

I have a really conceptual question on vibrational partition function for a diatomic molecule.If we consider a diatomic molecule, we write : Energy of simple harmonic oscillator=E_{i}=(n + 1/2) h\nu.We plug this eqn. into Z_{vib}=\sum e^{-\beta\epsilon_{i}}. Now , my question, is that the...

We know electron has potential energy as shown in fig 1 . Now in my book ( Charles Kittel) it is written that kronig and penney modified this to be a square potential as shown in fig 2. How is the potential in fig 2( inkronig penney model) drawn to be positive (Vo) if in figure 1 it is shown to...

I am disappointed . No reply after over 200 views. I found out the answer myself.For all the people who didn't know, 1)This is due to Maxwell's boundary conditions at an interface. E_{1}^{||}-E_{2}^{||}=0 where E_{1}, E_{2} represent fields in air and conductor respectively. 2)As radiation...

I just have a small question regarding lorentz cavity: Refer to a small lorentz cavity in a uniformly polarised dielectric. as shown in fig. E_{ex}: External electric field. E_{P}: Electric field in the uniformly polarised dielectric (when sphere has NOT been cut out) E_{L}:Electric field...

I have got 2 questions: 1)In the derivation of Planck's Radiation Law,we assume an enclosure of perfectly reflecting walls which contains diffuse radiations.These are EM waves which reflect from the walls. Now, in my book(or even http://thermalhub.org/topics/DerivationofPlancksLaw"), it is...

Thanks a LOT, pseudophonist. I think I have understood it now fully.

I have studied the mathematical portion of this, the solving of poisson eqn, etc.But still, I cannot grasp the physical interpretation. See, a charge creates a electric field 360 degrees around it.Now there is definitely an electric field between positively-charged ionised donors and...

Since away from the depletion region, the p region and the n region is STILL electrically neutral , How is this electric field due to charges in depletion region in the p and n regions "counteracted" ??

I have a related question on pn junctions. See the attchment. Now, why is the barrier potential constant on both sides outside the depletion region. for eg. The negative charges in the depletion region should create a negative potential=f(x), not constant.similarly with positive charges...