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Issue 12 | Dec 1970 | pp. 1373-1505

Issue 11 | Nov 1970 | pp. 1273-1371

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Select this Article		Demography and Thermodynamics Elihu Fein American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1373 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The use of physics for demographic analyses is not a form of alchemy. A brief reflection on the use of abstract structures to organize knowledge suggests a commonness to both social and physical science. Population distribution is examined using the structure of thermodynamics.

Select this Article		Who Named the -ON's? Charles T. Walker and Glen A. Slack American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1380 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Many entities in physics have both particlelike and wavelike properties. In representing the particlelike properties physicists usually use words ending in -ON. The originators of the concept underlying the particle nature, and the coiners of the name are discussed for the following “particles”: boson, electron, exciton, fermion, magnon, neutron, phonon, photon, plasmon, polariton, polaron, proton, and roton.

Select this Article		White Light Fringes Obtained with the Michelson Interferometer P. A. Young and D. E. O'Connor American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1390 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Circular white light fringes are seen when a dispersing medium is placed in one arm of a Michelson interferometer. A formula for the number of fringes as a function of the bandwidth of the source and the dispersion of the medium is obtained which agrees well with experiment. The phenomenon has been made into a student experiment on wave groups.

Select this Article		Multiple Reflection in Potential-Barrier Scattering J. E. Beam American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1395 \| Cited 3 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The standard quantum mechanical problem of scattering of an incident plane wave by a rectangular potential barrier in one dimension is examined from a point of view which emphasizes the multiple-scattering contributions to the reflected and transmitted, waves. This approach is used to gain insight into the phenomenon of resonant scattering of a wave packet by a potential barrier.

Select this Article		The Evolution of the Two-Dimensional Maxwell-Boltzmann Distribution John Novak and Alfred B. Bortz American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1402 \| Cited 3 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A computer simulation of a two-dimensional ideal gas has been studied in order to observe the time development of the speed distribution function. The results described here are effective in demonstrating to naturally skeptical freshmen that the Maxwell-Boltzmann distribution indeed occurs in nature. The results are also useful to demonstrate the statistical nature of the second law of thermodynamics.

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Dec 1970

Volume 38, Issue 12, pp. 1373-1505

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Select this Article		An Individualized Approach to Introductory Physics John S. Rigden American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1407 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Introductory physics courses are typically specialized in that they are designed for a very specific audience; physics majors, premeds, liberal arts students, etc. The categories are numerous. Further, these courses are usually highly structured with homework assignments, laboratories, and lectures establishing the cadence. The majority of students respond by progressing in lock-step fashion through the course. In this course at tne University of Missouri—St. Louis, there is no specialized audience and there is no cadence—more correctly, the cadence is drastically muted. The students supply the rhythm as the learning of physics is made an individual matter. A variety of learning devices are made available, and the student opts those that hold promise for him. No attempt is made to survey the subject of physics; rather, two major topics form the subject content. One of these topics is developed in a quasihistorical fashion to give the student some feel for physics in its verb sense. The conceptual structure of physics is sweepingly potent and alluringly intelligible—this course is designed to convey these facts.

Select this Article		Determination of Interference Patterns from Laser Produced Schlieren Interferometry S. S. Penner, W. Davidor, and F. Bien American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1413 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The known expression for the Doppler frequency shift may be used in the derivation of the relation for interference-intensity patterns in Young's modified double-slit arrangement with a monochromatic source. Alternately, the statement that the interference-fringe maxima formed in the observation plane must move downward as a density gradient ahead of a collimating lens moves upward are sufficient to establish Doppler's law for the effect of velocity on frequency shift. The theoretical result has actually been confirmed by Schwar and Weinberg in experiments that were designed to demonstrate the use of schlieren interferometry with a laser source in velocity measurements on flames.

Select this Article		The Computer in General Physics Instruction C. Stannard American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1416 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract This paper describes an experimental use of computer terminals for instructional purposes in a university-level general physics course over a 2-yr period. Programs have been written to simulate physical problems otherwise difficult for the student to investigate. The student specifies all of the important parameters and observes the calculated result which can be displayed in graphical form. Prior to the simulated experiment, a tutorial series of questions in a multiple choice format is used to familiarize the student with the problem and to help him make an intelligent parameter selection. Similar questions can be used to guide the analysis of the results after the calculations and to allow him to repeat the simulation with variations of any or all parameters. In the particular example given here, the student can launch a satellite into orbit with his own choice of parameters. The program ensures that be cannot consider physically meaningless values. The results of computer managed instruction (CMI) programs, student reactions to them, estimates of their cost and the present and future impact of the computer on our physics curriculum are discussed.

Select this Article		Nuclear Magnetic Resonance Line Shapes in Solids G. W. Parker American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1432 \| Cited 3 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The local field model introduced by Bloembergen, Purcell, and Pound is shown by direct calculation in a specific case to produce a Gaussian local field distribution which shape is often characteristic of nuclear magnetic resonance lines in solids. That this result is obtained is shown to be due to the fact that the binomial distribution describes the local field distribution of a system of spin ½ particles provided they are more or less uniformly distributed in space and that there is a sufficiently large number of them. In the limit of a large number of spins this distribution is known to become Gaussian in shape so that the local field model can be said to predict a Gaussian line shape under rather general conditions.

Select this Article		A Note on Certain Integrals Which Appear in the Theory of the Ideal Quantum Gases Robert Nyden Hill American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1440 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Integrals of powers of the energy over the Bose-Einstein and Fermi-Dirac distributions are special cases of Lerch's zeta function. As a consequence, various results for these integrals follow directly from results recorded in the mathematical literature on special functions. The low-temperature series for the Fermi-Dirac case is considered as an example and derived from results recorded in the Bateman project. Alternative rigorous derivations of this series, useful for classroom presentation, are also given.

Select this Article		Radiation from a Uniformly Accelerated Charge H. A. Atwater American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1447 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The radiation from a uniformly accelerated charge is calculated by transformation of the covariant field tensor with the use of a transformation law which is designed to preserve the velocity of light in the accelerated frame. Both the accelerated charge as seen by a resting observer and a charge at rest as seen by a uniformly accelerated observer are shown to exhibit radiation under these conditions.

Select this Article		A Note on the Uniform Field Approximation when Guard Rings Are Used Kazutoshi Asano, Arnold W. Dipert, and Charles D. Hendricks American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1452 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The uniform electric field approximation of parallel plates with guard rings is well recognized. However, near corners a high electric field exists in some circumstances, and it can give rise to electron or ion emission. A theoretical study of this field intensity, for example, shows that for a 10-mm electrode separation, 2-mm gap between an electrode and a guard ring, and a 0.005-mm corner radius, the electric field is as high as 5.4 times the uniform field found between infinite plane electrodes.

Select this Article		Propagators J. R. Terrall American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1455 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract This is a straightforward discourse that starts with a radio antenna and winds up with the propagator for Dirac particles. From the radio antenna we obtain the physical idea of a propagator and show its nature for Klein-Gordon particles (with photons as a special case). Then, from the Klein-Gordon propagator we easily obtain the propagator for Dirac particles, merely by imposing what might be called the “Dirac condition.” We hope the approach has simplicity and physical appeal.

Select this Article		Elementary Treatment of Relativistic Cross Sections J. R. Terrall American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1460 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The primary purpose of this paper is to show that, when relativity must be taken into account, there is no need to revise the ordinary definition of a cross section. Rather, a slight rearrangement of factors will obtain Lorentz invariant quantities. To demonstrate invariance is quite simple. Next, the reaction rate density can easily be written down just by bringing together, from a particle viewpoint, the various factors we know on physical grounds should be present. Again, by judicious grouping, the result can be expressed as a product of factors that are separately invariant. We go on to discuss the Lorentz transformation of an angular distribution (without explicitly using the Lorentz transformation equations), the relativistic normalization of wave functions, and finally, the connection of our simple approach with S-matrix theory.

Select this Article		Instructional Uses of the Computer: Rocket Trajectory Simulation Douglas S. Gale American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1475 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Simulation of Classical Many-Body Systems Martin Eger American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1475 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Another Example of the Use of the “Negative Mass” Concept in Mechanics Stuart L. Meyer American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1476 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Douglas Fir Echo Chamber Frank S. Crawford American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1477 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		An Apparatus to Demonstrate Molecular Interactions on an Air Table V. B. Elings and D. T. Phillips American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1478 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Superregenerative FET Oscillator for NQR, ESR, and NMR F. Bruin and H. Khunaysir American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1480 \| Cited 2 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		A Simple Velocity of Light Measurement for the Undergraduate Laboratory R. V. Smith and D. S. Edmonds, Jr. American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1481 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Uniqueness Theorem Used in the Problems of Images in Dielectrics N. Anderson American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1483 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		An Experiment in Undergraduate and Graduate Teaching and an Evaluation David S. Falk and N. S. Wall American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1485 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Boundary Conditions in Electrodynamics Hari Prakash and Naresh Chandra American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1487 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Maxwell's Equations in a Rotating Reference Frame G. E. Modesitt American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1487 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Note on Azimuthal Angle and Angular Momentum in Quantum Mechanics K. Kraus American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1489 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Comment on an Inelastic Collision Service Charles Jacobs American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1490 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Proceedings of the American Association of Teachers: Report of the Summer Meeting at the University of Wyoming, 18–20 June 1970 and Abstracts of Papers Delivered American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1494 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Statement of Ownership, Management, and Circulation G. F. Gilbert American Journal of Physics -- December 1970 -- Volume 38, Issue 12, pp. 1505 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable