ISSN:0002-9505    

DOI:10.1119/1.1987934

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1987935

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

A simple and inexpensive model to demonstrate the pulsed magnetic resonance phenomenon is described. It can be easily constructed in an undergraduate laboratory and can provide a direct demonstration of the precessional motion of a magnetic moment in a steady magnetic field. The decay of the signal induced by the precessing magnetic moment can be displayed on an oscilloscope. The model is quite suitable for demonstration in a classroom.

ISSN:0002-9505    

DOI:10.1119/1.1987936

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

A traditional part of the “education” of a physics graduate student is facing his first class as a teaching assistant. Unfortunately, the most the new teaching assistant learns from this encounter is how little he knows about teaching. The laboratory instructors orientation program at Kansas State University offers the instructors an opportunity to see some of the problems he will face and some methods for handling them before he begins teaching. The program, which includes introductions to Transactional Analysis and Piaget's theory of intellectual development, is based on laboratory experiences undertaken by the new instructor before classes begin.

ISSN:0002-9505    

DOI:10.1119/1.1987937

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

A simple experiment suited for use in an advanced laboratory course in particle physics is described. The magnetic moment of cosmic ray muons which have some polarization is determined with an error of about ±5% after ten days of running.

ISSN:0002-9505    

DOI:10.1119/1.1987938

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

The simple well-known form of the Kramers-Krönig dispersion relation that connects the real part of the refractive index with the absorption coefficient in a medium must be modified if the medium is optically active. It is most enlightening to make the correct generalization because the point of departure from the derivation of the conventional dispersion relation involves the subtle analysis of crossing symmetry used mostly in high energy particle physics. An interrelation between the very familiar physical theory for the refractive index of a dilute medium and crossing symmetry is clearly of pedagogical interest especially so when the phenomena involved are basic tools in chemistry, namely optical activity and circular dichroism. The modified dispersion relation leads to the correct relationship between the optical rotary power and the differential absorption in circular dichroism for the medium. Finally it is shown that the Rosenfeld-Condon expression for optical rotary power follows from a sharp line approximation for the absorption coefficients.

ISSN:0002-9505    

DOI:10.1119/1.1987939

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

Concurrently with the recently published work of Jones and Vacanti, the authors have developed a similar method for providing visual displays of electrostatic fields. However the preparation of the displays is somewhat different and leads, the authors believe, to higher quality reproductions. The purpose of the present note is to describe the method which utilizes the familiar field-mapping technique using resistive paper (teledeltos) and the thermal properties of cholesteric liquid crystals. As well some of the displays are presented here to demonstrate the effectiveness of this new electrostatics teaching aid.

ISSN:0002-9505    

DOI:10.1119/1.1987940

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

A procedure is demonstrated for determining the Runge-Lenz vector for the non-relativistic, classical Kepler problem. This vector constant of the motion enables one to determine the orbit of the particle in a simple way. It is also useful in finding the quantum mechanical solutions for this problem and for systematically studying the symmetry characteristics involved. This article, however, stresses only the classical aspects. The method used can, with appropriate modification, be applied to other problems.

ISSN:0002-9505    

DOI:10.1119/1.1987941

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

The equation of state (ES) is a subject of the greatest interest in Statistical Mechanics and Chemical Physics. In this paper we present a simple and rigorous method by which the ES of simple systems can be obtained. The derivation requires at most the knowledge of the Maxwell distribution. The well known formula for the ES of a one-dimensional system of hard rods is derived exactly, as an illustration. The method can be generalized to higher dimensionality and to include other types of potential.

ISSN:0002-9505    

DOI:10.1119/1.1987942

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP

摘要:

Magnetic moments of atomic, molecular and nuclear systems are common topics in physics courses at all levels. In modern physics and quantum mechanics an extremely important class of problems is that of two body systems where the orbital motion of the two particles is described by a spherical harmonic wave function. The magnetic moment operator in this case is more complicated than the single particle case whereL = r × pandM = (q/2mc)L.The two particle problem is considered below in terms of the constituent angular momenta and an expression for the magnetic moment is found which is convenient to apply directly onto spherical harmonics.

ISSN:0002-9505    

DOI:10.1119/1.1987943

出版商:American Association of Physics Teachers    

年代:1974

数据来源: AIP