摘要:

The one-dimensional random walk problem has been generalized to allow for absorption at lattice sites, and then this technique has been used to study one velocity neutron diffusion. We show that most of the results that are normally obtained by solving the diffusion equation under appropriate boundary conditions, can be obtained directly. Various special cases have been considered, including leakage from a finite lattice and neutron-wave propagation in an infinite lattice.

ISSN:0002-9505    

DOI:10.1119/1.1986812

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

A large and increasing gap exists between the level and sophistication of the physics encountered by a student in his undergraduate work at a four-year college with no graduate program and the level and sophistication of the physics with which he must work in the PhD program of a large university. In order to help bridge this gap, Wichita State University designed an MS program especially for graduates of four-year colleges, with the intention of preparing them for PhD study at larger universities. This article describes the workings and results of the program and gives some insight into the planning of students for their careers in physics.

ISSN:0002-9505    

DOI:10.1119/1.1986813

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

Scalar diffraction theory is usually presented as a closed subject in current textbooks. Actually, the theory is extremely unsettled and open to original investigation, and the authors feel that student understanding and motivation could be significantly enhanced if the problematic nature of the theory were stressed. With this in mind, the Kirchhoff, Huygens and Rayleigh theories are reviewed, emphasizing the fundamental inconsistencies and contradictions which are often ignored. Instructive and provocative experiments are then described which confirm the unwarranted success of the theoretical solutions under extreme conditions. The investigations are based on the diffraction of microwaves by a circular aperture, and are on a level suitable for undergraduate work.

ISSN:0002-9505    

DOI:10.1119/1.1986814

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

This is the concluding part of a modernized rendition of Poincaré's Rendiconti paper on relativity, of which the first two parts appeared in the November 1971 and June 1972 issues of this Journal. It covers the last section of that paper, in which Poincaré develops in masterful, even if incomplete, fashion, a generalization of Newtonian gravitational theory, involving retarded action-at-a-distance interaction that is covariant under the Lorentz group. As the first such attempt it is of obvious historical significance. In addition, just as the first two parts, so this part, too, contains material of independent interest to the historian of the genesis of special relativity.

ISSN:0002-9505    

DOI:10.1119/1.1986815

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

The computer program described, designed for use in the second quarter of the beginning course for science and engineering majors at the University of California, Irvine, simulates an experimental investigation of a pulse in a rope. The student is provided with a “measurement” facility: If he enters time and position he is told the rope displacement. His problem is to discover enough about the disturbance to answer numerical questions about its behavior. Auxiliary facilities such as plotting and listing are provided. Checks are made as to the reasonableness of the student strategy, and suggestions are given based on these checks. It is hoped that through this simulation students can in many cases “discover” the preservation of “shape,” thex−vtdependence of the pulse.

ISSN:0002-9505    

DOI:10.1119/1.1986816

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

Intrinsic disorder of a simple type is discussed and recommended for inclusion in the undergraduate thermodynamics curriculum as a practical example. The concentration of intrinsic defects is calculated as a function of temperature. The dc conductivity and diffusion coefficient are also examined.

ISSN:0002-9505    

DOI:10.1119/1.1986817

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

A description of the use of the Keller method of instruction in a general physics class of 100 students is presented. This teaching technique is critically evaluated by comparing the performance of the students in the program with that of 100 students in a concurrent control group run by the traditional lecture method. It is found that performances are not significantly different and the cost of running the program is not excessive. Furthermore, student reaction to the program is found to be quite favorable.

ISSN:0002-9505    

DOI:10.1119/1.1986818

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

In undergraduate laboratories we frequently ask the student to use error theory to evaluate his results without giving him the opportunity to measure and analyze a large statistical sample to see how well it follows theoretical models. In the experiment described here, the student investigates the statistics of a set of resistors. In the process he gets some practice in the use and interpretation of histograms, and gains some insight into the relation of the Gaussian error curve and a real statistical distribution as well as the significance of standard deviation and standard error..

ISSN:0002-9505    

DOI:10.1119/1.1986819

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

摘要:

A method is presented for determining the location and magnification of images formed by holographic reconstruction. The method is based upon the similarity between a hologram and a zone plate. An undergraduate student familiar with introductory optics should be able to understand the method presented.

ISSN:0002-9505    

DOI:10.1119/1.1986820

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1986821

出版商:American Association of Physics Teachers    

年代:1972

数据来源: AIP