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Issue 12 | Dec 1973 | pp. 1309-1386

Issue 11 | Nov 1973 | pp. 1219-1307

Issue 10 | Oct 1973 | pp. 1131-1218

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Volume 1

Select this Article		Conducting-Paper—Liquid-Crystal Fields Displays Thomas B. Jones and David C. Vacanti American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1314 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A novel technique for the color visual display of two-dimensional electrostatic fields is described. Temperature-sensitive encapsulated liquid crystals in sheet form are bonded to carbon-impregnated conducting paper on which a prescribed electrode configuration has been painted. The joule heating of the conducting paper creates a non-uniform two-dimensional temperature field to which the liquid crystals respond with color changes. Bands of uniform color identify isotherms which under certain conditions correspond to lines of constant electric field magnitude. The technique is applied to the study of various problems in electrostatics and potential fluid flow.

Select this Article		An Introductory Mechanics Laboratory at UICC H. S. Goldberg American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1319 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A modified version of the MIT air table is used as the foundation for a new, noncalculus mechanics laboratory. The motivation is to streamline and simplify the required equipment and to de-emphasize experimental techniques so as to give students a better opportunity to articulate and test their understanding of the classroom concepts. By using faculty members as instructors in the laboratory we have enhanced the educational environment and have brought the laboratory and classroom closer to a single entity. Details of the modified MIT air table are included in Appendix A.

Select this Article		Experimentally Determined Functional Relationships for Small-Amplitude Oscillations Albert D. Grauer and Charles E. Pittman American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1328 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract An experimental procedure is presented which enables the beginning or intermediate student of mechanics to use linear air track apparatus to determine the functional relationship between the period, mass, and spring constant for small amplitude oscillatory motion. The results of a typical set of experiments as well as two different methods for obtaining the desired mathematical expression are included. The resulting expression agrees well with that which can be derived analytically from Hooke's law.

Select this Article		Magnetic Repulsion: An Introductory Experiment Alfred Romer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1332 \| Cited 4 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract To measure the repulsion between two bar magnets gives students direct experience of action at a distance and of an inverse square force. This can be done using a balance assembled from standard laboratory components. The results are analyzed by assuming an interaction between two fixed poles located near the ends of the magnets, the force between them varying inversely with the square of the distance. The theory can be extended to cover all the interactions of the two pairs of poles. Calculations from the extended theory show that within the useful range of the experiment there are no induction effects and the poles do remain fixed. Although these theories are inconsistent with the usual presentation of electromagnetic forces arising from the interactions of charges, the experiment is useful as an illustration of model-building in physics.

Select this Article		Classical Scattering Cross Section for a Cut-Off Coulomb Potential William M. MacDonald American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1337 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The penetration of matter by charged particles and of transport coefficients for ionized gases are often calculated by the method of impact parameters wherein the Coulomb scattering cross section is set equal to zero for orbits with impact parameters larger than the range of the force. The method does not correspond to a reasonable assumption on the interaction, however, and it is sometimes difficult for students in classical mechanics and plasma physics to accept. It is therefore interesting that the cross section for scattering by a Coulomb force which is zero beyond a certain radius of interaction can easily be calculated by the methods usually presented in junior-senior level courses in classical mechanics. The result provides a simple basis for the method of impact parameters.

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Dec 1973

Volume 41, Issue 12, pp. 1309-1386

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Select this Article		The Robert A. Millikan Lecture Award 1973 Kenneth W. Ford American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1309 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Teaching and Learning Frank Oppenheimer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1310 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Copernicus and His Prescient Revolution V. V. Raman American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1341 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A remarkable feature in the life and work of Copernicus is that one can detect in them patterns and modes which were to characterize the future course of the scientific enterprise. It seems as though it was not simply a new era in science that Copernicus inaugurated; unknowingly, he also gave some indications of the nature of science and of the scientific mind in the centuries to follow.

Select this Article		Optical Rotatory Power in a Classical One-Electron Model G. E. Desobry and P. K. Kabir American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1350 Online Publication Date: Jul 2005 Full Text: \| Download PDF See Also: Erratum
	+ -	Show Abstract According to Kuhn, in a classical treatment of Drude's one-particle model, an electron constrained to move along a helix exhibits no optical activity. On the other hand, Condon, Altar, and Eyring showed that a quantum-mechanical one-particle model, an electron confined in a twisted anisotropic harmonic-oscillator well, possesses optical activity even in the classical limit. We therefore re-examined Kuhn's analysis and found that while the Drude model does not have the usual kind of optical activity, it does exhibit rotatory power which is proportional to the intensity of the incident light for low intensities. This effect has a simple physical interpretation.

Select this Article		Time Evolution of Predictions in Statistical Mechanics Barry M. Casper, Susan Freier, and David Van Atta American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1358 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Predictions in statistical mechanics may be viewed as the result of a three-stage process. To illustrate this process we consider a classical simple harmonic oscillator whose initial position and energy are not precisely specified. It is felt that this approach can aid in illuminating similarities and points of difference between statistical mechanics and quantum mechanics.

Select this Article		Random-Walk Model of Thermal Noise for Students in Elementary Physics Richard W. Henry American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1361 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A random-walk model of electronic motion in a resistor connected to an integrating ammeter is used to obtain an expression for the rms thermal noise current as a function of integration time. The thermal noise current is compared with the shot noise current in a temperature-limited diode (also found by an elementary derivation), and a simple demonstration experiment is suggested for testing the theory. The derivations and demonstration should prove useful to students who are mathematically unsophisticated but who might someday be users of sensitive electronic instrumentation.

Select this Article		An Experiment on Electronic Noise in the Freshman Laboratory D. L. Livesey and D. L. McLeod American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1364 \| Cited 2 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A simple method is described for investigating the shot-noise voltage developed across a resistor in series with a saturated thermionic diode. By measuring the ratio of the shot-noise voltage per unit current to the thermal noise in the same resistor, the effect of the amplifier bandwidth is eliminated and the ratio of the elementary charge to Boltzmann's constant is readily evaluated.

Select this Article		Simple Interpretation of the Schwarzschild Radius J. D. Shelton American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1368 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Stokes's Theorem in Dielectrics J. Higbie American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1369 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Coille Effect: A Manifestation of the Reversibility of Light Rays Frank S. Crawford American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1370 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Erratum: “Scattering of Charged Particles by a Localized Magnetic Field.” [Am. J. Phys. 41, 822 (1973)] I. Richard Lapidus American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1371 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Student Written Computer Programs Donald L. Shirer, Editor and Dwight M. Harris, Author American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1372 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Turtle Teaches Thinking Donald L. Shirer, Editor American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1373 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Right Justifying Basic Output Donald L. Shirer, Editor American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1373 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Comment on “Probability Distribution of Momenta in an Infinite Square-Well Potential” S. A. Fulling American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1374 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Comment on “Elementary Use of Spheroidal Coordinates” G. Arfken American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1375 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Acknowledgment of Comment by Professor Arfken C. L. Andrews and D. P. Margolis American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1376 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Science and Controversy A. J. Meadows, Author and Gerald S. Hawkins, Reviewer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1377 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		The Foundations of Quantum Theory Sol Wieder, Author and Roald K. Wangsness, Reviewer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1378 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Interatomic Potentials Ian M. Torrens, Author and Harry C. Jacobson, Reviewer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1379 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Principles of Plasma Physics Nicholas A. Krall, Author, Alvin W. Trivelpiece, Author, and Robert A. Gross, Reviewer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1380 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		The New Physics John G. Taylor, Author and D. R. Gustafson, Reviewer American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1381 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Report of the Executive Officer Arnold A. Strassenburg American Journal of Physics -- December 1973 -- Volume 41, Issue 12, pp. 1384 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 1973 -- Volume 41, Issue 12, pp. 1386 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable