摘要:

A simplified method for computing the energy yield in Čerenkov radiation by a fast-moving particle is described. The formalism is applied to the Čerenkov radiation of an electron-positron pair.

ISSN:0002-9505    

DOI:10.1119/1.1972894

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

摘要:

A simple apparatus is described which serves to demonstrate both the buildup and decay of radioactivity. The buildup is observed by, in effect, periodically sampling the radioactivity during activation. The sampling is effected by mounting Ag foil on a wheel which rotates it alternately between a neutron source and a beta detector.

ISSN:0002-9505    

DOI:10.1119/1.1972895

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

摘要:

A simple approach is presented to the problem of Fresnel diffraction by an uniform half plane of arbitrary transmission and phase delay. A simple extension of the Cornu spiral allows this graphical device to provide a ready solution for this situation as well as for the opaque half plane. A laboratory experiment for advanced undergraduates may be used to confirm the validity of the method.

ISSN:0002-9505    

DOI:10.1119/1.1972896

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

摘要:

The one-boson Lee model of a solvable field theory with nontrivial charge and mass renormalization provides an elementary example of the Lehmann-Symanzik-Zimmermann formalism. The basic quantities of interest in this method of calculation are the vacuum expectation values of time-ordered Heisenberg operators and by studying the analytic properties of the Fourier transforms of these functions, the first nontrivial subspace of the model is solved without resorting to eigenvalue equations. The full Lee model was recently analyzed with this technique and it seems pedagogically appropriate to carry out an analogous calculation in an even more elementary context.

ISSN:0002-9505    

DOI:10.1119/1.1972897

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

摘要:

An electromagnetic model of a “potential barrier” may be constructed from three sectors of waveguide, two outer sectors being filled with dielectric, the short inner sector air-filled. Using the mathematical analogy between the propagation data of the De Broglie wave and the wave inside a waveguide—above and below cutoff—it is demonstrated that, for a frequency of operation between the cutoff frequencies of the air-filled and the dielectric-filled waveguide, the air-filled section represents the potential barrier region. Thus the described apparatus, the construction of which has been carried out in full detail, enables the modeling of the tunnel effect experimentally and in a quantitative fashion.

ISSN:0002-9505    

DOI:10.1119/1.1972898

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1972899

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1972900

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1972901

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1972902

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1972903

出版商:American Association of Physics Teachers    

年代:1966

数据来源: AIP