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Issue 12 | Dec 1962 | pp. 851-944

Issue 11 | Nov 1962 | pp. 783-849

Issue 10 | Oct 1962 | pp. 665-781

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Select this Article		Apparatus Drawings Project. Report Number 32. Launching Tube for a Laboratory Experiment on Projectile Motion T. Walley Williams, III American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 851 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A ball rolled down the tube of this apparatus is launched upward at various elevation angles as a projectile. Using as data the heights of three points on the tube, the student must consider potential energy, linear and rotational kinetic energy, frictional corrections, and projectile motion to predict the impact point of the ball.

Select this Article		Analogy between Nuclear Chain Reacting Systems and Vibrating Strings and Membranes Shiv Datt Pabbi American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 854 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The analogy between the one-group theory of nuclear chain reacting systems and vibrating strings (or membranes) with similar geometry and boundary conditions is developed and some examples are considered. This should be useful as a class demonstration and may also help to give an idea of reactor buckling of assemblies with complex geometry.

Select this Article		A Simplified Treatment of the Quantum-Mechanical Scattering Problem Using Wave Packets Russell K. Hobbie American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 857 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract This paper presents a treatment of quantum-mechanical scattering suitable for a senior level course in modern physics. The entire treatment is based on the use of wave packets instead of unrealistic plane waves. The asymptotic behavior of the scattered wave packet is derived from physical considerations, and the Born approximation is then obtained for a wave packet in a manner which displays the details of the scattering process.

Select this Article		A Device to Demonstrate the Reciprocal Lattice Concept in Relation to Single-Crystal X-Ray Diffraction Patterns A. McL. Mathieson American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 864 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The condition for diffraction of x rays is the coincidence of a reciprocal lattice point with the circumference of the reflecting circle. A mechanical-optical analogy is used to illustrate the genesis of single-crystal diffraction patterns.

Select this Article		A Demonstration of the Magnetic Mirror Effect Ronald J. Allen American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 867 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A description is given of the magnetic mirror effect exhibited by charged particles spiralling into a converging magnetic field. The apparatus makes use of a commercial electron tube filled with an inert gas, originally designed for measuring the specific charge of the electron. The necessary field configuration is provided by an ordinary bar magnet. Measurements of pitch angle at various points of the particle trajectories were made from photographs of the spiral orbits. The magnetic field strength corresponding to these points was determined independently from extensive field measurements carried out near the end of the bar magnet. The ratio of field strengths at two different points of the particle trajectory as a function of the spiral pitch angles at those points is compared with theory.

SECTION LISTING

BROWSE VOLUMES

Dec 1962

Volume 30, Issue 12, pp. 851-944

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Select this Article		Proportional Counter H. P. Stabler, Editor American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. xiii Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Small Ventilating Hood, Thermal Wire Stripper H. P. Stabler, Editor American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. xiii Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Helium Monochromatic Light Source, Optical Flats H. P. Stabler, Editor American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. xiv Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Quartz Lenses, Optical Quartz H. P. Stabler, Editor American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. xiv Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Homogeneous Nucleation of Vapor Condensation. I. Thermodynamic Aspects James E. McDonald American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 870 \| Cited 34 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract In absence of all foreign materials or wall surfaces, phase transitions of the type vapor-to-liquid or liquid-to-solid are blocked by an activation-free-energy barrier. The latter arises from surface-free energy increases resulting from appearance of embryos of the more condensed phase. The thermodynamics of this type of phase transition are examined in Part I for the particular case of vapor condensation, a case for which theory and experiment now stand in tolerably good agreement. In Part II, kinetic aspects will be considered.

Select this Article		An American Physicist's Year in Europe: Henry A. Rowland, 1875–1876 Samuel Rezneck American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 877 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract Henry Augustus Rowland was born in Honesdale, Pennsylvania, in 1848, into a family of ministerial tradition, but he himself at an early age displayed an inclination toward and precocious gift for scientific experiment. The first twenty-seven years of his life were spent in self-preparation for a scientific career, although formally trained as a civil engineer at Rensselaer Polytechnic Institute, where he also taught physics. In 1875 occurred his “discovery” by Daniel C. Gilman, founder and first President of the new Johns Hopkins University, then in search of a suitable faculty. Now came his great opportunity, which Rowland eagerly seized upon, to spend a year in Europe, on salary from Johns Hopkins. Rowland's zealous and rewarding exploitation of this opportunity is the theme of this article. Rowland's letters and travel journal supply abundant material revealing how he traveled widely across Europe from Ireland to France, to Germany, Switzerland and Austria, and everywhere he visited the physical laboratories. He met many of the European men of science, inspected their facilities, and actually performed an important experiment in electromagnetism in Helmholtz's laboratory in Berlin. His critical commentary provides a unique survey of the state of physics in Europe at this time. In May, 1876, Rowland returned to America, unusually well-informed and self-assured, to assume the responsibilities of his new position as the first professor of physics in the Johns Hopkins University, where he built a distinguished scientific career for himself, broken off unhappily by his premature death in 1901.

Select this Article		Observables of Relativistic Particles L. M. Garrido and J. Sesma American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 887 \| Cited 1 time Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract We study the most general unitary transformation that transforms the Hamiltonians of particles of spins 0, ½, or 1, into Hamiltonians containing even or odd matrices only. We present also the expressions for the position operators for each transformation that are valid for the three kinds of particles mentioned above.

Select this Article		Lecture Demonstration of Electron Diffraction John M. Fowler, William Warren, and Edward D. Lambe American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 891 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract A demonstration of the diffraction of a beam of electrons by a thin film of gold is constructed inside a black-and-white television tube. A pattern of concentric diffraction rings around a central maximum appears on the screen of a tube in which a thin gold film has been inserted in front of the electron beam. Since the two brightest of these can be seen clearly from a distance of at least forty feet in a darkened lecture room, the demonstration is suitable for large audiences.

Select this Article		Density Matrix Representations J. D. Patterson American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 894 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The relations between the ordinary density matrix, the density matrix in the coordinate representation, the Löwdin density matrices, the Dirac density matrix, and other density matrices are traced. The roles of pure and mixed cases, equilibrium and nonequilibrium situations, and single- and many-body representations are considered.

Select this Article		Long-Time Transition Probabilities for a Two-Level System Interacting with a Stochastic Electromagnetic Field F. W. Cummings American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 898 \| Cited 2 times Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The purpose of this paper is to demonstrate solutions of Schrödinger's equations for a two-level quantum system which is coupled to a radiation field. The electric (or magnetic) field, which is considered as a definite (if unknown) function of time E(t), is characterized by a power spectrum or its related correlation function. Long-time transition probabilities are obtained in the form of a contour integral under the assumption of small atom-field coupling. The contour integral can be easily evaluated for many cases of interest. In particular, it is shown how a two level system in interaction with a blackbody approaches the Maxwell-Boltzmann distribution as t → infin.

Select this Article		Strobe Photography with the General Radio 1531—A Strobotac David C. Eldridge, Edward M. Skinner, and James Tsepas American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 921 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The new General Radio Strobotac, a stroboscopic tachometer, has been a useful tool for high school science projects and as a teaching aid. In addition to its use for multiflash it can be employed as a single-flash unit, being easily triggered by a beam of light, a sound wave, or by simple contact. The treatment is comprehensive, covering the photography of shock waves, standing waves, splashes, and ripple tank phenomena.

Select this Article		Studies of the Electronic Structure of Covalent Semiconductors by EPR G. Bemski American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 902 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract This paper reviews the basic theory of impurity states in semiconductors as applied to “shallow donors” in silicon. It points out the role of the electron paramagnetic resonance (EPR) technique in investigating such states in silicon and the relation of experiments to the theory. The transition between electrons localized at these impurities and those free to conduct is also discussed in relation to silicon. Finally, an example of EPR experiments on conduction electrons in InSb is also given, completing the range of investigations from the localized to completely free electrons in covalent semiconductors.

Select this Article		Coefficients of Diffusion, Viscosity, and Thermal Conductivity of a Gas Edward A. Desloge American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 911 Online Publication Date: Jul 2005 Full Text: \| Download PDF
	+ -	Show Abstract The coefficients of diffusion, viscosity, and thermal conductivity of a gas are derived in first approximation following the method of Maxwell and Chapman. The derivation differs from previous derivations primarily in the expression and evaluation of the various collision integrals.

Select this Article		Large Demonstration Electroscope H. W. Dosso and R. H. Vidal American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 926 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Source Equation for Magnetic Flux Density Moody L. Coffman American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 926 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		FBI Two Gun Rules John V. Kline American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 927 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Simple ESR Experiments at Low Magnetic Fields Alan B. Grossberg American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 927 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Comments on Second-Order Electric Field Due to Conduction Currents J. C. McGroddy and J. L. Stanford American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 928 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Relative Force between Moving Charges Kemp Bennett Kolb American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 929 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Screen for Optical Demonstrations Robert A. Lufburrow American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 929 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Demonstrations of Weightlessness Haym Kruglak American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 929 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Electrostatic Precipitation G. E. Perry American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 930 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Newton's Second Law Raymond J. Seeger American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 930 Online Publication Date: Jul 2005 Full Text: \| Download PDF
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Select this Article		Archimides' Principle Clifton Bob Clark American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 932 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		States of Matter E. A. Moelwyn-Hughes, Author and H. L. Armstrong, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 932 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		The Method of Functionals in the Quantum Theory of Fields Yu. Novozhilov, Author, A. V. Tulub, Author, and Raymond J. Seeger, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 933 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Scientists: Their Psychological World Bernice T. Eiduson, Author and Raymond J. Seeger, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 933 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Introduction to Hypersonic Flow G. G. Chernyi, Author, R. F. Probstein, Editor, and Raymond J. Seeger, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 934 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		A History of Astronomy A. Pannekoek, Author and Raymond J. Seeger, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 934 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Chladni Figures—A Study in Symmetry Mary Désireé Waller, Author and Raymond J. Seeger, Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 935 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable

Select this Article		Theoretical Physics Gerhard A. Blass, Author and F. W. Van Name, Jr., Reviewer American Journal of Physics -- December 1962 -- Volume 30, Issue 12, pp. 935 Online Publication Date: Jul 2005 Full Text: \| Download PDF
		Abstract Unavailable