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Volume 32

Issue 12 | Dec 1964 | pp. 905-971

Issue 11 | Nov 1964 | pp. 819-904

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Select this Article		Resource Letter PhM-1 on Philosophical Foundations of Classical Mechanics Mary Hesse American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 905 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Prepared at the request of the AAPT Committee on Resource Letters; supported by a grant from the National Science Foundation. 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 Arnold Arons, Chairman, Resource Letter Committee, Department of Physics, Amherst College, Amherst, Massachusetts. Notation: The letter E after an item number indicates elementary level, useful principally for freshman liberal arts through sophomore physics courses; the letter I indicates intermediate (junior, senior) level; and the letter A indicates advanced material principally suited for senior, graduate study. An asterisk (∗) indicates items particularly recommended for introductory study. Additional copies: Available from American Institute of Physics, 335 East 45 Street, New York, New York, 10017. When ordering, request Resource Letter PhM-1 and enclose a stamped return envelope. A small booklet containing reprints of some of the fundamental references will soon be available for purchase from the American Institute of Physics.

Select this Article		Note on the Use of the Gibbs Entropy Postulate in Statistical Mechanics Zevi W. Salsburg and Noel C. Willis, Jr. American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 912 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract In developing the ensemble theory of statistical mechanics, the thermodynamic temperature T, can be introduced in a direct manner avoiding the intermediate use of a Lagrange multiplier, if one adopts the Gibbs entropy postulate and uses a general criterion for thermodynamic equilibrium. This procedure is described in detail for both closed and open systems.

Select this Article		Mechanical Resonance (Experiment) Sema'an I. Salem and Earl R. Ault American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 914 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract An experiment, based on the change in the velocity of the oscillating mass with applied frequency, has been designed and put to use. It is inexpensive and simple to build, and it may be valuable in an intermediate physics course.

Select this Article		Demonstration of Displacement Current Hans Meissner American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 916 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract An apparatus is described in which the displacement current in a barium titanate capacitor forms the primary of a toroidal transformer with a Permalloy core surrounding the capacitor. The voltage output of the transformer increases with the square of the frequency. At f = 2kcps and a supply voltage of 50 V an output voltage of 50 mV is obtained.

Select this Article		Coherence and Fluctuations in Light Beams W. Martienssen and E. Spiller American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 919 \| Cited 32 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A quasithermal, quasmonochromatic lamp is described which serves as a highly degenerate light source with adjustable coherence time between 10⁻⁵ sec and 1 sec. This lamp is used for several demonstration experiments concerning the relations between coherence and fluctuations: The intensity interferometer of Hanbury Brown and Twiss is applied to measure the correlations between intensity fluctuations. The double slit experiment of Young serves to stress the role of fluctuations for classical interferometry. Interference patterns from two independent quasithermal lamps are presented.

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Dec 1964

Volume 32, Issue 12, pp. 905-971

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Select this Article		Miniature Chart Recorder Donald E. Olson, Editor American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. xiii Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		A G-M Tube for Low-Level Counting Donald E. Olson, Editor American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. xiii Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		High-Voltage Power Supply Donald E. Olson, Editor American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. xiv Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Open-Ended Problem Instruction in General Physics Noah Lerman American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 927 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Despite the undisputed importance attached to problem-solving activities in college and university physics courses, problem teaching methods have changed little since 1900. A possible explanation of this paradoxical combination of importance and stagnation is lack of awareness of the tremendous range of activities that problem work could provide for teaching students the skills and attitudes of creative physicists—if taught in a way very different from the usual methods of today. The plausibility of this explanation is enhanced by the critique of current problem teaching methods presented in this paper. Present-day methods are evaluated on the basis of six specific objectives of physics-problem teaching, derived from an analysis of the skills and attitudes involved when a creative physicist tackles a problem in his own work. It is shown that conventional methods aim at only one of these six objectives. A new approach, making use of open-ended problems and designed to attain all six objectives, is presented. It is illustrated by a detailed teaching sample and additional procedural remarks, in order to facilitate experimentation with the method.

Select this Article		Coherence and Correlation—Two Advanced Experiments in Optics D. Bloor American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 936 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Two “open-ended” optical experiments, intended to bridge the gap between teaching and research laboratories, are described briefly. They are designed to test the capabilities of all students while requiring only the simplest laboratory equipment.

Select this Article		Some Diagnostic Experiments to Accompany a Plasma-Physics Course B. E. Burke and F. W. Crawford American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 942 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract There has been a considerable growth of interest in many aspects of plasma physics during recent years. This has been reflected in the introduction of new courses, or the expansion of old ones, in many colleges and universities to cater to the needs of students interested in this field. Laboratory experience constitutes an extremely valuable adjunct to teaching courses. There is, consequently, a considerable value in introducing experimental work wherever possible. This paper describes some laboratory experiments, requiring a minimum of expensive equipment, and which serve to introduce the student to useful diagnostic techniques which are founded on very basic models of plasma behavior. They have been tested in the laboratory and adopted for a laboratory instruction course given to graduate electrical engineers and physicists at Stanford University.

Select this Article		Experiments on Film in the Elementary Physics Laboratory D. H. Rogers American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 950 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The successful use of three films: Momentum of Electrons, The Ultimate Speed, and Time Dilation as “experiments” in the second year Physics Laboratory is described. The regular experiments in the laboratory are used to teach experiment design, measurement, and error calculation; and the film experiments were used to show how real physicists designed and performed their experiments using the same principles. The films also permitted the “use” of equipment not normally available to second-year students. Working in pairs, the students viewed the films, took data from the instruments shown, estimated the error in the measurements, then wrote up the experiment as a normal laboratory report. While the use of Momentum of Electrons as an “experiment” was not as successful as was this use of the other two films, the class was enthusiastic over all three films, and was unanimous in wanting at least one film experiment of this type each year.

Select this Article		The Equation of Motion for Relativistic Particles and Systems with a Variable Rest Mass Kalman B. Pomeranz American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 955 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract If the rest mass is constant the equation of motion may be presented in the form: force equals time rate of change in momentum. However, if the rest mass varies because there is an influx or or efflux of mass, the equation of motion may include additional terms to account for the momentum flux. These terms are derived by applying the impulse-momentum principal and the work-energy principle. The relativistic equation of motion gives the thrust as a function of the influx or efflux velocity, the rate of mass flow, and the Lorentz factor [1 − (v²∕c²)]½ for the system.

Select this Article		Newton in the College Classroom Alfred M. Bork American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 959 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract One segment of a course for nonscience majors using limited parts of Newton's Principia is described. The relevant source material is reviewed. The class studied in detail the proofs of some of the early theorems in the Principia, including the law of areas for central forces and the relation between forces and motion in conic sections. In spite of warnings in the literature, this was not too difficult; the students' background in geometry proved to be adequate to the task. It is suggested that it may be possible to follow a similar approach in high-school physics, or in the last several months of high-school geometry. In contrast with the usual course for nonscience majors and with most beginning courses in physics, Newton rapidly obtains important results. Using the Principia provides an introduction to the history of science in one detailed situation where some aspects of Newton's thought processes are examined.

Select this Article		On Elastic and Inelastic Collisions of Bodies H. L. Armstrong American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 964 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Mass, Weight, and the “Quantity” of a Body Alfred Romer American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 965 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Electrical Essays Ray Hefferlin American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 966 Online Publication Date: Jul 2005 Full Text: \| Download PDF See Also: Erratum
		Abstract Unavailable

Select this Article		Large-Scale Electrical Demonstration John Hart American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 967 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Maxwell and Variable Mass Charles F. Mate American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 968 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Nu or Vee? Lorenz D. Huff American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 968 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Mathematical Aspects of Physics: An Introduction Francis Bitter, Author and Albert A. Mullin, Reviewer American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 969 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Iowa Section Mary Briant American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 969 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Chicago Section Isidor Lerner American Journal of Physics -- December 1964 -- Volume 32, Issue 12, pp. 969 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable