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Table of Content
20 October 2014 Volume 33 Issue 10
著者文摘
Importance of application treatment in statistical physics course
. 2014, 33(10): 1-1.
Abstract
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916
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1113
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A difficult problem,i. e.,applicative treatment for the result in statistical physics course is discussed. These applications considered here are the Stirling＇s formula; the summation being replaced by an integration; the series expansion at high and low temperatures,respectively. Their mathematical base and physical use are analyzed and we compare the precision of various results by using numerical calculation.
Reflection and interference of Bose-Einstein condensates in one-dimensional infinite well of half space
. 2014, 33(10): 5-5.
Abstract
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831
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(1939KB) (
499
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By the propagator method in quantum mechanics,the evolution of Bose-Einstein condensates matter in one-dimensional infinite deep trap of the half space is studied. The reflection phenomenon and the self-interference pattern are observed. Due to changings of the initial position,the width and velocity of condensed matter,different interference pattern is formed in space. We use the volatility characteristic of matter waves to give a good description,at the same time,by using particle characteristic of matter waves,we explain well the collision problem of matter waves in the well wall.
Klein tunneling of the massless chiral Dirac fermions
. 2014, 33(10): 10-10.
Abstract
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1771
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1726
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Tunneling of the massless chiral particle through a barrier is studied. The transmission probability of the chiral particle through a barrier is calculated carefully and the movement characteristics are illustrated in the barrier region. We also give the simple physical viewpoints in order to understand Klein tunneling and it is very useful to understand barrier tunneling in quantum mechanics.
Discussion on oblique collision of two smooth ball with variable coefficient of restitution
. 2014, 33(10): 14-14.
Abstract
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1470
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712
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To regard the coefficient of restitution as the function which is related to the point of contact,we utilize the function to calculate the loss of energy and the elastic potential energystored in the process of oblique collision. By investigating,the problem of oblique collision can be simplified by the variable coefficient of restitution.
Establishing for definite equations of electromagnetic field in inhomogeneous dielectric
. 2014, 33(10): 17-17.
Abstract
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981
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(346KB) (
1086
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Aiming at the electromagnetic field in inhomogeneous medium,the establishing process of definite equations is investigated,combing with the first-order partial differential field equation and state relation,from the steady field to the time-varying field,the various forms of inhomogeneous partial differential equation with variable coefficients are given conceptually,which provids a theoretical basis for solving electromagnetic field problems.
A general proof of the proportionality between relativistic energy and moving mass
. 2014, 33(10): 20-20.
Abstract
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927
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(335KB) (
618
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The principle of relativity requires that the expressions for particle＇s momentum and energy take the same functional form in all inertial frames. We present a general proof that the relativistic energy has to be proportional to the moving mass. This result is a self-consistent requirement of relativity. It does not dependence on the specific form of linear space-time transformations,nor does it require the postulation of an invariant speed of light.The proof further implies that conservation of mass in general follows from conservation of energy.
An experiment of “hearing light”
. 2014, 33(10): 24-24.
Abstract
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799
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698
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When an alternating light irradiate on a transparent glass bottle with a half inner wall coated by black regalia,a sound in the bottle can be heared. The reason is that the light produce heat which excites a sound resonance mode of the bottle.
The measurement of the speed of light
. 2014, 33(10): 26-26.
Abstract
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1067
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2454
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Taking the people,events and time as the main clue,several most important experimental measurements for the speed of light are introduced. Also,a summary of the history of determination of the speed of light is given.
Discussion on the cause of tide
. 2014, 33(10): 31-31.
Abstract
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1458
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(322KB) (
911
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The properties of the tidal force are analyzed. The vector of the tide is applied to calculate the high of the tide. Finally,the article explains how semi-diurnal and diurnal tide are generated,and analyzes their properties roughly.
The experimental design of Helmholtz carousel demonstrator
. 2014, 33(10): 35-35.
Abstract
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1107
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1280
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The technology roadmap and design skills for producing Helmholtz carousel are described. The device cleverly transfers sound pressure of the neck into rotary power through the principle of Helmholtz resonator,and can be used to study the relationship between resonance and the intensity of the external sound source frequency,intensity and physical parameters of resonator by demonstrating the rotation speed of the resonator. Experiments show that the device has good teaching effect.
Derivation of Pauli equation in non-relativistic framework——An inconsistency between classical electrodynamics and quantum mechanics
. 2014, 33(10): 38-38.
Abstract
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1232
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(364KB) (
812
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An equation of motion satisfied by free two-component Pauli spinors is derived by seeking the square root of the Hamiltonian operator of a free electron,starting from Schrdinger equation in the non-relativistic framework. Then,using the minimum coupling principle,an equation of motion for an electron in the external electromagnetic fields,the so-called Pauli equation,is obtained. Based on it,an inconsistency between classical electrodynamics and quantum mechanics is explored,and the analysis for relativistic spin and non-relativistic spin is carried out from the representation theory of groups and the quantization.
How to correctly use the dielectric constant to handle the electrodynamics of conductive medium
. 2014, 33(10): 41-41.
Abstract
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1053
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724
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In the discussion of electromagnetic（ EM） wave propagating in conductors,a majority of Chinese electrodynamics textbooks start from EM wave propagation in an insulating dielectric,and then describe EM wave propagation in conductors upon the introduction of a complex permittivity. Such a treatment makes the form of EMwave equation for a conductor fully consistent with that for an insulating medium. But a lot of textbooks do not provide an analysis of the physical meaning of the complex permittivity before the relevant discussions. This could easily lead to confusions for students who could suppose incorrectly that the complex permittivity introduced here for a conducting dielectric medium is exactly the dielectric constant of metals for EM waves. Secondly,most of the textbooks do not distinguish different underlying mechanisms that lead to high-reflective characteristics for EM waves incident either on the surface of a conductor with a good conductivity or on a metallic conductor. In this article,the author discusses the concept of complex permittivity,followed with the analysis on several issues that adopt this concept and finally make some suggestions for peer reference in their teaching.
Teaching university students “A-B effects”
. 2014, 33(10): 45-45.
Abstract
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809
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(342KB) (
651
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This paper describes the experience of the author in teaching university students for the physical properties of the A-B effects and the magnetic vector potential A,in combination of research.
Spontaneous Breaking of Electromagnetic-Duality Symmetries in Electrodynamics Containing magnetic monopoles
. 2014, 33(10): 48-48.
Abstract
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804
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(580KB) (
1060
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This paper firstly provides a new point that the existence of magnetic monopoles will break the electro-magnetic duality symmetry of electrodynamics spontaneously and points out the existence of relevant goldston bosons; then analyzes the difficulties encounting the electrodynamics action description and expressed the viewpoint that electrodynamics containging no magnetic monopoles is more symmetric than that containing them; finaly makes a simple introduction to the concept of two kinds of magnetic monopoles.
Chopstick in negative-index “water”
. 2014, 33(10): 54-54.
Abstract
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992
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PDF
(3380KB) (
644
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Recently,research on negative-index material has become a hot frontier topic in physics,which not only attracted extensive public attention with lots of related pictures appearing online,but also have been selected by some university teachers in related course teaching. Here,we systematically study the imaging problems for a chopstick or a sphere put into a cup filled with negative-index＂water＂. Our results not only clarify some misunderstandings existing in current public medium related to such problems,but also enrich our knowledge of negative-refraction imaging. We hope this work can provide valuable assistance to teaching relevant knowledge in related courses.
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