摘要:

An explicit representation of the permutation operator in terms of coordinate and momentum operators is derived.

ISSN:0002-9505    

DOI:10.1119/1.11890

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

摘要:

An exact solution of a Faraday’s law problem with a nonlinear term is presented. The results are compared with those obtained by the perturbation methods of Poisson and Poincaré and of Kryloff and Bogoliuboff. The reasons for the superiority of the latter method are enumerated.

ISSN:0002-9505    

DOI:10.1119/1.11891

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

摘要:

The good‐as‐new postulate applied to radioactivity says: The conditional probability that a radioactive atom will ’’live’’ past times+t, given that it has lived past times, is equal to the unconditional probability that it would have lived past timet, starting from time zero. This postulate leads directly to the conclusion that the decay time of a radioactive atom is an exponentially distributed random variable. Add the postulate that the decay times of individual atoms in an aggregrate of identical radioactive atoms are independent, and a complete description of the random behavior of an aggregrate can be constructed. This approach stresses from the outset the randomness inherent in the radioactive decay process and is offered as a complement to the deterministic approach that treats fluctuations about mean values. All results are exact within the context of the model and are applicable to aggregrates of any size—no assumptions about large numbers are required.

ISSN:0002-9505    

DOI:10.1119/1.11892

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

摘要:

This paper presents a method of studyingRLCcircuits with the help of the oscilloscope in theXYZmode, complemented by an electronic device which generates a marker‐trace on the screen and which is used to measure frequencies without needing any reference point on the screen. Although the electronic device can be used in a fairly quantitative manner, the authors have proved its special utility in the teaching of electric resonance, since it shows the phenomena associated with electric resonance in a very intuitive way.

ISSN:0002-9505    

DOI:10.1119/1.11868

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

摘要:

The method of Wigner distribution functions, and the Weyl correspondence between quantum and classical variables, are extended from the usual kind of canonically conjugate position and momentum operators to the case of an angle and angular momentum operator pair. The sense in which one has a description of quantum mechanics using classical phase‐space language is much clarified by this extension.

ISSN:0002-9505    

DOI:10.1119/1.11869

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

摘要:

In this paper we wish to illuminate the axiom that the quantal state describes a statistical ensemble of similar systems identically prepared, and is not to be identified with any single system. The mathematical representative of the general quantum state is the density matrix or statistical operator in Hilbert space. We demonstrate how this operator may be determined empirically by calculations involving only the measured mean values of a set of observables we call a ’’quorum.’’ As an example of this approach a state determination procedure is described for a spinless particle moving in one dimension; the corresponding quorum turns out to involve only position data associated with various instants subsequent to the act of preparation.

ISSN:0002-9505    

DOI:10.1119/1.11870

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.11871

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.11872

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.11873

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.11875

出版商:American Association of Physics Teachers    

年代:1979

数据来源: AIP