ISSN:0002-9505    

DOI:10.1119/1.17725

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.17727

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

A bare‐bones skeleton of quantum mechanics is used to do the calculations underlying both Mermin’s example of a Bell inequality and his example of the Greenberger–Horne–Zeilinger discovery. An example of a recent discovery by Hardy also is discussed. It demonstrates the inconsistency between quantum mechanics and Einstein–Podolsky–Rosen assumptions in a way quite like that of Greenberger, Horne, and Zeilinger, without inequalities, but it requires only two particles with spin 1/2.

ISSN:0002-9505    

DOI:10.1119/1.17752

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

A gedanken experiment discovered by Lucien Hardy is translated into a very direct black‐box gedanken demonstration of quantum nonlocality with red and green lights, using only two far apart detectors each of which operates in only two modes. The quantum mechanical underpinnings of the gedanken demonstration are quite simple. (This paper provides a text for the Klopsteg Memorial Lecture to the American Association of Physics Teachers at Notre Dame University, August 11, 1994.)

ISSN:0002-9505    

DOI:10.1119/1.17733

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

It is suggested how Bernhard Riemann might have discovered General Relativity soon after 1854 and how today’s undergraduate students can be given a glimpse of this before, or independently of, their study of Special Relativity. At the same time, the whole field of relativity theory is briefly surveyed from the space–time point of view.

ISSN:0002-9505    

DOI:10.1119/1.17734

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

Are science and religion independent or conflicting systems of thought? This question was the focus of a course on science and religion given at Brooklyn College. The class explored the underlying metaphysical assumptions, sources of knowledge, and methodologies of science and religion from philosophical and historical perspectives. The conclusion is that science and religion are basically independent modes of inquiry, but they have come into conflict over questions about the origin, history, and nature of the physical world. These are areas in which science has been far more successful in providing fruitful explanations and predictions. Nevertheless, the limitations of science and the scientific method must be understood and respected.

ISSN:0002-9505    

DOI:10.1119/1.17735

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

The classical motion of a chargeein an electromagnetic fieldF=E+iB(in units withc=1) is given by the component‐free spinorial form of the Lorentz‐force equation, namely, Λ̇=e/2m FΛ. Heremis the mass of the charge, and Λ represents the Lorentz transformation connecting the rest frame of the charge to the observer’s frame. The development is formulated in the geometric (Clifford) algebra of real three‐dimensional space, the Pauli algebra, whose elements are all vectors in a complex four‐dimensional space with the Minkowski spacetime metric. Explicit solutions are easy to write down for any constant and uniformEandB, and they take a particularly simple form in the case presented here of perpendicular fields of equal strength:F2=0.

ISSN:0002-9505    

DOI:10.1119/1.17736

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

A unified approach towards spectral shifts in general relativity brings the cosmological and gravitational redshifts within the same framework as the more familiar Doppler effect. This approach was first proposed by Synge [Relativity:TheGeneralTheory(North‐Holland, Amsterdam 1960)] and is described here in a more simplified form.

ISSN:0002-9505    

DOI:10.1119/1.17679

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

Conventional discussions of Maxwell’s equations in free space have for many years taken a historical approach starting with electrostatics and magnetostatics, and have taught us that the sources ofEare electric charge andḂ, and the sources ofBare electric current andĖ. However, a direct dynamic reading of Maxwell’s differential equations leads unquestionably to the surprisingly different conclusions that the sources ofEare electric current and curlB, and the single source ofBis curlE. In this dynamic reading of Maxwell’s equations, electric field is generated locally by electric current, and fields propagate away from the current source by the dual mechanisms of curlEgeneratingBlocally and curlBgeneratingElocally.

ISSN:0002-9505    

DOI:10.1119/1.17680

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP

摘要:

In this paper we reexamine the known argument by which Maxwell’s equations are ‘‘derived’’ from the gauge invariance of quantum mechanics, or alternatively, from the gauge invariance of classical mechanics. We point out that this argument is ambiguous in the sense that it may lead us equally to another theory different from that of Maxwell, namely, an electromagnetic theory in Euclidean four space. We attempt to enliven our discussion by presenting it as a dialogue between God and the Devil.

ISSN:0002-9505    

DOI:10.1119/1.17681

出版商:American Association of Physics Teachers    

年代:1994

数据来源: AIP