ISSN:0002-9505    

DOI:10.1119/1.1975216

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1975217

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

A description is given of the construction and use of a furnace specifically designed to produce F-centers in alkali halide crystals by additive coloration. The method described avoids corrosion or contamination during the coloration process. Examination of the resultant crystals is discussed and several experiments using additively colored crystals are mentioned.

ISSN:0002-9505    

DOI:10.1119/1.1975218

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

This paper was presented on 5 February 1969 at a joint symposium of the AAPT and APS on the history and philosophy of physics, held during the AAPT-APS annual meeting.

ISSN:0002-9505    

DOI:10.1119/1.1975219

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

The development of Lorentz' theory of electrons is reviewed insofar as it relates to the problem of the electrodynamics of moving bodies. It is shown that the principle of relativity did not play an important role in the Lorentz theory, and that though Lorentz eventually realized the distinctions between his own work and that of Einstein, he was unwilling to completely embrace the Einstein formulation and thereby reject the ether.

ISSN:0002-9505    

DOI:10.1119/1.1975220

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

The development of an autonomous Computer-Assisted-Instruction (CAI) general-education physics course is described. Based on a one-term conventional course which has been given successfully at Florida State University for several years, the CAI course makes use of an IBM 1500 Instructional System to guide the student through a self-paced program of textbook reading assignments and homework problems, audiotaped lectures, PSSC movies, and film strips of demonstration experiments. The computer provides programmed instruction, giving the student a diagnostic quiz after completion of each unit which he must pass before being allowed to proceed to the next unit. Review lessons on an IBM 1440 Computer System are provided as a supplement to both the CAI course and the conventional course. The CAI course was given for credit to 23 students in the fall of 1967 and to 37 students in the spring of 1968 with satisfactory results which gave some evidence that increasing involvement with CAI seems to produce better grades. Although the number of students involved was small, we conclude that it is possible to give an autonomous CAI physics course that is not only successful in presenting the material to the student, but is also interesting and attractive to the average student.

ISSN:0002-9505    

DOI:10.1119/1.1975221

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

This paper endeavors to show, by means of an example, the usefulness of the analog computer as a demonstration tool for undergraduate students. The treatment of the problem is basically theoretical, using laws developed early in physics courses. The results of the computations may be observed graphically or on an oscilloscope, depending upon the circumstances of the demonstration. Also discussed are the distortions of the ball due to impact and possibilities of expanding the problem to include more complex approximations to the real situation.

ISSN:0002-9505    

DOI:10.1119/1.1975185

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

An apparatus has been constructed for the free suspension of charged particles and droplets in the range 5–200 μ and for their study with respect to charge and mass and their variations with time in various gaseous environments. The apparatus and its functioning are described and illustrated by various applications. It is thought to be a useful research tool in physics, physical chemistry, and other disciplines and also to be useful in laboratory courses on the graduate and undergraduate levels.

ISSN:0002-9505    

DOI:10.1119/1.1975186

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

Three problems in radioactive buildup and decay are presented and solved. Matrices are introduced for the solution of the second problem, and the third example deals in a simple way with flux depression.

ISSN:0002-9505    

DOI:10.1119/1.1975187

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP

摘要:

By the introduction of the compressivity and the permittivity tensors, the governing equations for a lossy, compressible, and anisotropic electron plasma are reformulated. The compressivity tensor takes into account the thermal motions of the electrons, while the permittivity tensor characterizes the anisotropy of the medium due to an external static magnetic field. A general dispersion relation with the coefficients in terms of the components of the compressivity and the permittivity tensors is obtained. The nature of the small oscillations in the plasma is thus determined completely by the two tensors. In the general case, the dispersion relation cannot be factorized into products which show the coupling between electromagnetic and plasma waves. Various simplifying assumptions which give some insight into the complex structure of the dispersion relation are examined. Some numerical results are also included.

ISSN:0002-9505    

DOI:10.1119/1.1975188

出版商:American Association of Physics Teachers    

年代:1969

数据来源: AIP