摘要:

We prove that a wave-packet solution in the WKB approximation to the Schrödinger equation follows the classical trajectory, and we discuss the nature of this solution.

ISSN:0002-9505    

DOI:10.1119/1.1986554

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

A possible physical interpretation is given for the second balance equation associated with the telegrapher's equations.

ISSN:0002-9505    

DOI:10.1119/1.1986555

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

A project on computer assisted physics laboratory instruction (Projectcaplin)has led to the development of material used in a first semester introductory physics laboratory for nonscience majors. In the laboratory the student first obtains data from traditional laboratory experiments. The student then has the option to use parts (or all) of preprogrammed computer material designed to: (1) accept the experimental data and scan it for inconsistencies; (2) carry out an error analysis on the data; (3) perform calculations of physical parameters based on the experimental data; (4) yield tabular displays of calculated results; and (5) yield graphical displays of results. In some cases, computer programs allow simulation of experiments with the possibility of altering values of parameters or experimental details. It has been observed that the computer aided laboratories have considerably improved comprehension of data error analysis, of graphic representation of physical concepts, and have aided in carrying out calculational phases of the experiment left to the student. Furthermore, laboratory time saved through the use of the computer system has enabled expansion of the scope of individual laboratories.

ISSN:0002-9505    

DOI:10.1119/1.1986556

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

Classical mechanics based on Lagrangians with higher order derivatives is investigated. It is found that this generalization does not lead to any new feature of the theory, apart from an increase of the dimensionality of phase space. Conserved quantities are also derived that reduce to the usual ones in the absence of higher derivatives.

ISSN:0002-9505    

DOI:10.1119/1.1986557

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

An analog solution was obtained for the Nernst-Planck and Poisson equations which describe the ion concentration across a simple membrane held at a potential difference V. These equations constitute a nonlinear system of differential equations. It was learned that even though electroneutrality was assumed as a boundary condition, it did not hold within the membrane itself. The electric field variation within the membrane was also determined.

ISSN:0002-9505    

DOI:10.1119/1.1986558

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

An experiment involving a conducting sphere that oscillates between two electrodes is described. Theory is presented that predicts a linear relationship between frequency and applied voltage for the system, regardless of electrode configuration. Data taken for several geometries is in good agreement with this theory. Some properties of the oscillator system, including its desirable characteristics as a high voltage voltmeter, are discussed.

ISSN:0002-9505    

DOI:10.1119/1.1986559

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

The nonlinearity of Einstein's gravitational equations produces three-body forces in the equations of motion. One of their consequences is that the motion of an electron around a nucleus (or a satellite around a planet) is slowed down by the existence of a distant massive body. This is the familiar gravitational red shift, which can thus be derived without invoking the equivalence principle.

ISSN:0002-9505    

DOI:10.1119/1.1986560

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

Electron optics is especially suited as a topic for independent study as part of a computer applications course. The principles are elementary, and the student gains greater understanding of the classical similarities between particles and waves. A method of solution is illustrated, and the results appear more reliable than those existing in prior literature.

ISSN:0002-9505    

DOI:10.1119/1.1986561

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

The teaching of the process of science in physics courses is discussed with reference to recent intellectual trends. Arguments and examples indicate that “process courses” must necessarily involve philosophical questions and questions of social criticism currently raised. A description is given of an interdisciplinary upper-division course for science and nonscience majors that incorporates some of the features advocated.

ISSN:0002-9505    

DOI:10.1119/1.1986562

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

Certain aspects of the so-called Ehrenfest paradox are discussed. It is pointed out that while the Ehrenfest description of uniform rotation is not in keeping with relativity, the “paradox” per se is independent of this fact, and rests solely upon an imprecise use of notation.

ISSN:0002-9505    

DOI:10.1119/1.1986563

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP