American Journal of Physics

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Diffracted field by an arbitrary aperture
American Journal of Physics - Tập 67 Số 1 - Trang 87-92 - 1999
Alfredo Dubra, José A. Ferrari
Diffraction patterns of apertures on screens uniformly illuminated are standard calculations in undergraduate optics and acoustics courses. These calculations imply two-dimensional (2-D) integrations which are often performed in the far zone, at moderate angles of diffraction, i.e., using Fresnel and Fraunhofer approximations. In this note, the 2-D integration is reduced to a 1-D parametri...... hiện toàn bộ
The aerodynamics of tennis balls—The topspin lob
American Journal of Physics - Tập 56 Số 2 - Trang 138-142 - 1988
Antonín Štěpánek
A general description is presented of the calculation of the ballistic trajectory of a flying spinning ball acted on, in addition to the forces of gravity and drag, by the so-called Magnus force. By applying the regression analysis to results of wind-tunnel measurement of the drag and lift coefficients of a spinning ball, a calculation of the nonlinear differential equation of the hodograp...... hiện toàn bộ
Einstein’s opposition to the quantum theory
American Journal of Physics - Tập 58 Số 7 - Trang 673-683 - 1990
Robert J. Deltete, Reed A. Guy
Einstein’s opposition to the quantum theory is well known to physicists, but his reasons for being dissatisfied are not. Einstein regarded the theory as not only incomplete, but as fundamentally inadequate. He believed that the only reasonable interpretation of the quantum formalism was an ‘‘ensemble interpretation,’’ but he also thought that this interpretation and others were incomplete ...... hiện toàn bộ
Giải Thích Copenhagen Dịch bởi AI
American Journal of Physics - Tập 40 Số 8 - Trang 1098-1116 - 1972
Henry P. Stapp
Quá trình này nhằm đưa ra một cái nhìn thống nhất về bản chất logic của giải thích Copenhagen trong lý thuyết lượng tử. Điểm mấu chốt là lý thuyết lượng tử có tính thực tiễn một cách cơ bản, nhưng vẫn hoàn chỉnh. Khó khăn chính trong việc hiểu lý thuyết lượng tử nằm ở chỗ tính hoàn chỉnh của nó không tương thích với sự tồn tại bên ngoài của continuum không-thời gian trong vật lý cổ điển.
On the Physics of Drag Racing
American Journal of Physics - Tập 41 Số 3 - Trang 311-313 - 1973
Geoffrey T. Fox
The sport of drag racing can be very usefully examined in an introductory mechanics course. The concepts of energy, momentum, acceleration, velocity, torque, and power are all involved in the analysis of the problem. Many students find the problem to be very contemporary and close to their own experience. High interest among the students usually results in increased understanding of the ph...... hiện toàn bộ
The suitability of 3D printed plastic parts for laboratory use
American Journal of Physics - Tập 83 Số 3 - Trang 281-285 - 2015
Andrew Zwicker, Josh Bloom, Robert Albertson, Sophia Gershman
3D printing has become popular for a variety of users, from home hobbyists to scientists and engineers interested in producing their own laboratory equipment. In order to determine the suitability of 3D printed parts for our plasma physics laboratory, we measured the accuracy, strength, vacuum compatibility, and electrical properties of pieces printed in plastic. The flexibility of rapidly...... hiện toàn bộ
An introduction to QBism with an application to the locality of quantum mechanics
American Journal of Physics - Tập 82 Số 8 - Trang 749-754 - 2014
Christopher A. Fuchs, N. David Mermin, Rüdiger Schack
We give an introduction to the QBist interpretation of quantum mechanics, which removes the paradoxes, conundra, and pseudo-problems that have plagued quantum foundations for the past nine decades. As an example, we show in detail how this interpretation eliminates “quantum nonlocality.”
Dirac deltas and discontinuous functions
American Journal of Physics - Tập 67 Số 5 - Trang 446-447 - 1999
David Griffiths, S. P. Walborn
Paul Langevin’s 1908 paper “On the Theory of Brownian Motion” [“Sur la théorie du mouvement brownien,” C. R. Acad. Sci. (Paris) 146, 530–533 (1908)]
American Journal of Physics - Tập 65 Số 11 - Trang 1079-1081 - 1997
Don S. Lemons, Anthony Gythiel
We present a translation of Paul Langevin’s landmark paper. In it Langevin successfully applied Newtonian dynamics to a Brownian particle and so invented an analytical approach to random processes which has remained useful to this day.
Plasmon surface polariton dispersion by direct optical observation
American Journal of Physics - Tập 48 Số 8 - Trang 669-672 - 1980
J. D. Swalen, Judith R. Gordon, Michael R. Philpott, Aldo Brillante, I. Pockrand, R. Santo
Simple optical techniques are described for the direct visual observation of the plasmon surface polariton dispersion curve, ω vs κ, and of the shift in the dispersion curve from overcoatings of different thicknesses. To see the dispersion curve, a collimated beam of white light is dispersed by a prism, and then focused by a cylindrical lens onto the base of a second prism coated with a th...... hiện toàn bộ
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