Recent content by santoshroy

No it is not a single particle behavibour but a single fluid behavibour. The He-4 system is a many body system, that exists in a superfliud state. The syetem is a fermionic system in which lambda transition takes place. The total spin is sum (i) spin (i) = S saturation spin.

Yes your interpretation is correct. This way of getting a minimised energy eigen value is actually variational principle where variation in E should be a extremum w.r.t the assumed density functional.

In any physical system we are concerned with energy lowering that leads to stability of the system. So the hamiltonian that is presented above H=sum (ij) J(ij) S(i).S(j) is a simplestic one illustrating the fact. 1.For a antiferromagnetic system neighbouring spins are opposite (+1/2) and...

Yes it is a typo. Arguments are the following... 1. Since Lz is responsible for the rotation so second term must contain Lz. 2.It is a simple transformation which can be written as... z`=z x'=xcos(theta)+ysin(theta) y'=-xsin(theta)+y cos(theta) Now we are dealing with Q.M. where...

Since the gradient and laplacian contain "coordinate" (d/dx, d2/dx2..)terms one has to replace to coordinate with c.m. coordinates, there will ofcourse will be a kinetic energy correction as K.E. contains terms like (d2/dx2). In another words Physically kinetic energy is not invariant in...

When radiation with a continuous spectrum is shined through H2 in ground state the following will occur. 1.The rotational degrees of freedom of H---H will get excited. 2. The vibrational degrees of freedom of H----H will get excited. 3.The electronic levels will get excited. Now...

Assuming you have calculated correctly, such large value is possible as you are trying to squeeze to wavefunction in a small space; atomic order. So a wavefunction with such a large curvature leads to a large kinetic energy. As kinetic energy is twice the derivative of "x". With a large kinetic...

Can help you sometimes through email...

A superfluid is a simple fuild and it's state is not destroyed by simple photography. I do not know the "biggest quantity" of superfluid made. So when you photograph a superfluid the perturbing energy wiil get transferred to the system that is maintaining its state.

My RAM in my brain does not support such a huge question, but I will try to answer. The velocity of light in a medium is becuse of a collective phenomenon : the medium is providing it with a " field " that is due to all the particles of the medium. So when you want to think in terms of photons...

If the atom were to be the only one in the universe this would not have happened. Simply the s-electron would not jump to a sub p orbital. But an atom is contantly puturbed means constantly there is a "push" here and there. So the atom wants to go to the state in which it is stable. So the...

May be the answer is " There is a definite relation between the exchange of information between particles the upper limit is speed of light "... . The rate of exchange depends on their relative distance, you can go from "distance space" to "momentum space" then you will realize that there is...

probability waves or simply probability associated with a particle is a "actual" property of the particle. Every particle or system can be visualized as a "wave" when you take the square of the amplitude of the wave you will get the actual "position " of the system. For a "localized" system...