Recent content by pangsiukwong

Dear all, Have you any idea about the electron speed at 0K when the electron is free? Patrick

Hi! The moment of inertia of solid sphere is 2/5 mr^2. However, when the sphere spins at light velocity, some articles state the moment of inertia is equal to 1/2 mr^2. However, no derivation is found in those articles. Would you suggest some articles / textbooks which show the derivation...

Hi!, Solving Maxwell equations for waveguides is a tedious work. :frown: Are there any programs, which can solve Maxwell equations for different kinds (geometries) of waveguides, and can give analytic solutions (i.e. give symbolic equations)? Therefore, the mathematical expressions of Ex...

Hi! ZapperZ, The concept of wavepackets also confuses me. I do not know why ONE frequency of electrons is measured if electrons are wavepackets. I guess the difference in frequency between waves, which superimpose together to form wavepackets, is very small. Therefore, one freqency is...

Hi! jostpuur, I know some physicists make use the model of a vibration of a point charge with subsequent a EM wave generation in order to explain the wave nature of the electron. Does it support the your statement "It is true that wave packets can have shape, but that is not in contradiction...

I do not understand why some scientistists think that elementary particles are a point without a spatial shape. Is it due to the wave nature of these particles? Born interpreted the wave function as a probability of finding the particle (e.g. electron). However, it is just an...

The magnetic moment of an electron is g x (e / 2 x m) x S. The term (e / 2 x m) x S is the classical expression of the magnetic moment which can be deduced by the model of (for example) a spinning charged sphere/disc/ring...etc (symmetric shape). Dirac's formula predicts the magnetic moment...

Hi! Although nobody can see the shape of elementary particles, we always assume that their shapes are symmetrical, for example, sphere. Why? Is the symmetry a law? Otherwise, are there any other reasons? Patrick

Hi! When a charge/current moves in a closed loop, a magnetic moment is generated. Is there any formula for connecting the magnetic moment to E-field and B-field? Patrick