Recent content by mohammed.omar

Thanks a lot M Quack

Or these spirals just come from spanning the lattice constant?

Thanks M Quack, So as the polar angle is increased the distance from the different planes changes and that is why we get a Spiral? If tihs is the case then why do they all have minima at the vertical axis?

Hello All, I've been reading about XRD and found this picture online: http://en.wikipedia.org/wiki/File:Aluminumpowderpattern.png My question, which might be due to the lack of background as I'm an ECE guy, is why are the FCC lattice vectors depicted of Spirals whose minima lie on the...

Hello Lozjek, Any time varying electromagnetic field, i.e. one that has both time varying electric and magnetic field will cause electromagnetic radiation. Thus, any oscillating electromagnetic field will ultimately cause radiation. What differs in one source from the other is their...

Hello Lozjek, There is a type of antennas called 'Helical Antennas' that resemble a solenoid more or less. They can be used in two main modes of radiation, the end-side and backfire mode. You can find plenty of information on them in any Antenna Design books, check out Antenna Theory by...

Hello theprofessor0, Sorry for the late reply. Your intuition about the mass of the particle is very beautiful but it omits the fact that the particles of the same energy but different masses do not need to oscillate with the same frequency or the same amplitude, they might have a lower...

Hi leoneri, Thanks to you :). For the spread mentioned in books; I get is as the following: If we have an ensemble of experiments and we measure the same parameter in all experiments and form a statistical average we will get a spread, i.e. each experiment will give a different result...

This conversation is really nice Infrasound, your point of view is very intuition driven and is helping me a lot think about the problem. Thanks to you :). If we neglect some non-idealities and differences between materials and neglect the quantization effects that occur at low temperature...

Let me put it in simple language. Internal vibrations do contribute to the internal energy. The particles contribute to the internal energy in the form of kinetic energy, during their motion around their equilibrium position, and contribute in the form of potential energy, during their...

According to statistical mechanics, the vibration of molecules contribute by \frac{1}{2} k T per molecule to the internal energy. Thus for solids, we have 3 Degrees of freedom for translational motion and 3 for the vibrational motion.

Hi leoneri, What really matters is what you mean by \Delta E and \Delta t. The best place I've read this was Griffith's book. It states that \Delta t and \Delta E are the standard deviations of the time required for the state of the body to change by \Delta E. In your case, if we know...

Hellow stone1, This is a quite common misunderstanding in Quantum mechanics. I didn't really understand it until I read Griffith's book. The uncertainty principle does not correspond to a single instance/experiment measurement, but it is a statistical results which states that if you...

You are right UndeniablyRex. Also, you'ld find it has no curl because it has no rotation about whatever axis

Hi UndeniablyRex, The divergence of a vector field gives the density of field flux flowing out of an infinitesimal volume dV. It is positive for outward flux and negative for inward flux. The curl on the other hand, gives the rotation of the field around the three main axes, taken in the...