Recent content by Abu Abdallah

I received this answer from Dr. Daniel Steck : ------------------------------------------------------------------ Hi (...) That book isn't my preferred one for thorough treatments, but the basic idea is that there is no proof for quantizing the electromagnetic field, you *postulate*...

Hi, The energy of the quantum mechanical harmonic oscillator is proved to be quantized after solving the Schrodingers equation which leads to Hermite equation and discovering that normalizable solutions of the wavefunction exist only for a discrete spectrum of energy. When the...

Hi, 1- In the introduction of the concepts of partition function and canonical ensemble, a system is assumed to be in direct contact with a heat bath (a thermal reservoir) where energy can be transferred between them. All thermodynamical properties of the system can be deduced from the...

I have several questions in quantum optics or the quantum theory of radiaition. I begin by the following three questions: How can a DC field ( static field) be constructed using photons ?? If the spin of photons is related to circular polarization of the constructing fields. How can...

Reilly, your reply was very informative. Conservation laws provide good reasons for us to understand why an interaction can happen or not, but for the particle itself I think there should be a more fundamental reason. The particle doesn't know that charge, for example , has to be conserved...

What about the second part of my message, regarding the excitation of atoms by discharge electrons? Any help about the details of this process? lalbatros, please check your private messages.

Michel, I think that your point of view has a lot of supporters specially between expermentalists. It may seem fair that whatever cannot be put in an experiment nowadays shouldn't be questioned. But I believe that asking questions for better understanding always has a benefit. New 'good'...

Hello I was thinkng of this question and I found it best expressed in a clear manner in another site. I quote the question and waiting for an asnwer: "Is it a fundamental property of electrons that they can absorb photons? Geometry requires that two points define a straight line. Geometry...

Hello How can a monochromatic light induce a transition ( absorption ) between two energy levels whose energy difference doesn't match the frequency of the incident light ?? A treatment using time dependent perturbation theory shows that the transition will occur even when the incident...

Energy is not an invariant quantity between different frames of reference. For example a particle having a kinetic energy in one frame has a zero kinetic energy in another frame. But what about interaction energy? If I know the interaction energy between 2 particles in one frame, how can I...

nrqed, calculate the probabiliyt density with respect to another frame (whose origin not at the proton) and you will find that \vert \psi(\vec r,t) \vert^2 has a maximum at the proton while the volume element is not zero there. Koantum, I know the force that attracts the electron to the...

In The L=0 states in Hydrogen atom, the electron has a maximum probablity to exist at r=0 ( at the location of the proton ) Is this logical? What prevents the electron then from falling on the proton? There is no angular momentum to prevent that !

How can we apply the same logic on my special case of two charges traveling orthogonal to each other at this instant? l ^ l l o...

I see since you can't defend your POV in the simple case of static fields ! Consider the very simple case of static fields, the electric field is completely given by the gradient of the electric potential. The magnetic force is always normal on the direction of motion of the charge hence it...

What about the special case mentioned in my message? How can we get the Lorentz force in the lab frame from such a lorentz transformation of the electric field in the charge rest frame ?