摘要:

Olsson’s coupled equations for a resonant spring pendulum are solved. To‐and‐fro transfer of energy from one mode to another is shown, the period for such a recurrence is derived, and the patterns of the mass trajectory are obtained. Experimental data are reported and good agreement is found with the theory.

ISSN:0002-9505    

DOI:10.1119/1.13696

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

We examine the question of what it is about the structure of relativistic quantum mechanics that causes the nonintuitive phenomenon of the Zitterbewegung of particle position to exist. Further, we examine various assumptions concerning the measurement process which are implicit in the observation of Zitterbewegung.

ISSN:0002-9505    

DOI:10.1119/1.13697

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

We examine a one‐dimensional problem involving two interacting particles in an external field for which the Schrödinger equation can be solved analytically for the ground state. The Hartree approximation for this system also has a simple analytic solution of the form previously derived by Foldy. Comparison of exact and Hartree solutions leads to precise estimates of the effect of correlations on the binding energy and on the two‐particle probability distribution.

ISSN:0002-9505    

DOI:10.1119/1.13682

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

It is shown how matrix methods in dimensional analysis can be used to convert the numerical values and units of electromagnetic quantities from the mksa system to the Gaussian system and vice versa. Examples are given which should convince the reader that the mentioned conversions can be performed with very little tedium.

ISSN:0002-9505    

DOI:10.1119/1.13683

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

The purpose of the present paper is to familiarize undergraduate students with the fission process. The stopping power of silver for252Cf fission fragments of various energies will be measured. The experimental value for the stopping power is obtained from the measured energy loss of the fission fragments for five different thicknesses of silver absorber. The results are favorably compared to calculations making use of a semiempirical theoretical formula developed by Lindhard and revised by Müller. The theory is of such a form that an undergraduate student in physics can easily do the calculations

ISSN:0002-9505    

DOI:10.1119/1.13684

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

In this paper we describe an electrical network, whose current evolution does agree with a Korteweg–de Vries equation. Our aim is to prepare pupils to understand the analytical aspects of nonlinear and dispersive phenomena, which very often are neglected in high‐school and graduate textbooks. Some historical remarks introduce the topic and a bibliography is provided.

ISSN:0002-9505    

DOI:10.1119/1.13685

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

The ‘‘spot of Arago’’ has been a controversial topic since its inception in 1818 when Poisson predicted its existence in an attempt to discredit Fresnel’s wave theory of light. Arago performed the experiment and found the surprising prediction was true, thus putting Fresnel’s theory on a firm technical foundation. In recent years, the spot of Arago, which exists as a bright spot at the center of the geometrical shadow of a circular obstruction, has caused substantial grief in various high‐energy laser applications and has come to be considered more of a nuisance than a curiosity. This paper suggests that the size and shape of the spot of Arago is characteristic of the wave‐front aberrations of the incident beam and can therefore be used to advantage as a beam sample for wave‐front analysis of annular beams. The implementation of this wave‐front sampling scheme would eliminate the requirement for a special beam‐sampling optical component and thus reduce to a minimum the deleterious effects upon the beam frequently accompanying the use of such components. Both experimental and numerical results are presented along with a discussion of the capabilities and limitations of this particular beam sample for diagnostic purposes.

ISSN:0002-9505    

DOI:10.1119/1.13681

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.13698

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.13699

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP

摘要:

Assuming a lifetime of 1030years for nucleons, it is shown that the expected human loss of life expectancy due to nucleon decay is equivalent to that of smoking 10−9cigarette per year. (AIP)

ISSN:0002-9505    

DOI:10.1119/1.13700

出版商:American Association of Physics Teachers    

年代:1984

数据来源: AIP