摘要:

Prepared at the request of the AAPT Committee on Resource Letters.This is one of a series of Resource Letters on different topics, intended to guide college physicists to some of the literature and other teaching aids that may help them improve course contents in specified fields of physics. No Resource Letter is meant to be exhaustive and complete; in time there may be more than one letter on some of the main subjects of interest. Comments and suggestions concerning the content and arrangement of letters as well as suggestions for future topics will be welcomed. Please send such communications to Professor Joel Gordon, Chairman, Resource Letter Committee, Department of Physics, Amherst College, Amherst, Massachusetts 01002.Additional copies:Available from the Executive Secretary, American Association of Physics Teachers, 335 East 45 Street, New York, N. Y. 10017. When ordering, request Resource Letter TLA-1 and enclose 25 cents per copy (not in stamps), together with a self-addressed stamped envelope.

ISSN:0002-9505    

DOI:10.1119/1.1976355

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

The potential of a point charge between two grounded conducting plates is expressed as a definite integral, simplifying a previous formula due to Pumplin. The potential is obtained exactly in closed form along a line passing through the charge.

ISSN:0002-9505    

DOI:10.1119/1.1976356

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

This paper reports an advanced undergraduate laboratory experiment concerning the helicon solid-state plasma wave. Student results are reported. The experiment is performed as an inexpensive dip in a liquid helium storage vessel. The experiment is made possible by the design of a small, superconducting magnet. The magnet is capable of attaining 18 kG and costs about $25. The whole experiment can be built by students in a week's time. When the experiment is completed, the student not only understands helicon propagation but also understands the use of the helicon to measure magnetoresistance and Hall coefficients in pure metals.

ISSN:0002-9505    

DOI:10.1119/1.1976357

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

The equations of electromagnetism, whether written in the electrostatic, electromagnetic, or symmetric system, whether in rationalized or nonrationalized form, express an invariant set of physical relationships. The same set of letter symbols is employed in each, system of equations; these symbols represent related, but different, quantities in the various systems. The relationships among corresponding symbols are given and applied to precise statements about the relation between the oersted and the ampere per meter, the abampere and the ampere, etc.

ISSN:0002-9505    

DOI:10.1119/1.1976358

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

The following set of experiments was designed for students just beginning to study cholesteric liquid crystals. It contains all of the information on materials and apparatus needed to perform thermal mapping. Wherever possible, materials which are readily available have been chosen. The experiments progress, each one somewhat more difficult than the preceding. No attempt has been made to give an outline of the properties of liquid crystal phases, but the reader is referred to A. Saupe's review article [Angew. Chem. Internat. Edit.7, No. 2, 97 (1968)] on the subject.

ISSN:0002-9505    

DOI:10.1119/1.1976360

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

Experiments dealing with laser mode structure are presented which are suitable for an upper division undergraduate laboratory. The theory of cavity modes is summarized. The mode structure of the radiation from a helium-neon laser is measured by using a photodiode detector and spectrum analyzer to detect intermode beating. Off-axial modes can be visually detected in the expanded laser beam and their presence correlated with signals displayed on the spectrum analyzer in agreement with the theory.

ISSN:0002-9505    

DOI:10.1119/1.1976361

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

The virial theorem is used for an elementary derivation of the exact equation of state of a two-dimensional plasma.

ISSN:0002-9505    

DOI:10.1119/1.1976362

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

Some aspects of the kinetic theory of transport coefficients are discussed in terms of simplified models. These models are a gas of one-dimensional rods and a gas ofd-dimensional rigid parallel “cubes.” The collision process is taken to be such that two molecules exchange velocities upon collision. For these models the elementary mean-free-path results are exact, up to an unknown factor of order unity appearing in a correction term.

ISSN:0002-9505    

DOI:10.1119/1.1976363

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

It is postulated that all dynamical laws must be formulated in terms of variables measured relative to interacting particles. This implies that the two-particle system is the fundamental interaction unit. When this postulate is applied to Newtonian mechanics, a radically new conceptual structure is revealed. The two major changes which result are the absence of the law of inertia and a broadening of the space and time invariance to include accelerated observers. Although energy and angular momentum remain conserved in this reformulation, the usual linear momentum theorem does not appear. It is further shown that the theory can be expressed in the Lagrangian and Hamiltonian formalisms in a straightforward manner. Finally, applications are made to several simple two-body and three-body systems which demonstrate that many-particle interactions can be formulated without reference to the dynamics of a single particle.

ISSN:0002-9505    

DOI:10.1119/1.1976364

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP

摘要:

Experiments are described in which the absorption and emission of energy at and near electron cyclotron resonance may be studied with simplified equipment. The magnetic field is measured by electron spin resonance, thus bringing out aspects of spin as well as orbital angular momentum; the magnetic field may also be measured by the radius of the electron orbit, rendered visible by low-pressure hydrogen. It is observed that, in a gas-focused electron beam tube, the frequencies of maximum electron cyclotron resonance absorption and emission (as determined by the zero crossing of the derivative of the line shape) are generally different from the frequency of electron spin resonance, and the frequency shifts are functions of electron beam current. The line shapes are asymmetric and are also functions of beam current. These effects are tentatively identified with plasma effects in the gas-focused beam.

ISSN:0002-9505    

DOI:10.1119/1.1976365

出版商:American Association of Physics Teachers    

年代:1970

数据来源: AIP