摘要:

The Stokes parameters have been found to offer a very convenient method for the description of polarization of both electromagnetic radiation and elementary particles. Their development is presented along with some applications to physical problems.

ISSN:0002-9505    

DOI:10.1119/1.1933744

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

Remarks made on the occasion of the presentation of the Oersted Award to Professor Clifford N. Wall.

ISSN:0002-9505    

DOI:10.1119/1.1933745

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

Remarks by Professor C. N. Wall on the occasion of his receiving the Oersted Medal for notable contributions to the teaching of physics at the twenty-third annual meeting, New York, January 29, 1954.

ISSN:0002-9505    

DOI:10.1119/1.1933746

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933747

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

This note points out that Gauss's law is insufficient, except in special cases, to solve simple problems in electrostatics. In any system of dielectrics and charged conductors an additional condition,viz., that the total free energy is at a minimum is necessary to determine the equilibrium values of the fields. As will be seen, this requirement amounts to the statement that in electrostatics the potential across any conductor is continuous. For the sake of generality, the permittivities of the dielectric media are considered to be inhomogeneous, temperature dependent and also field strength dependent. The last property being included in case some (or all) of the dielectrics have the perovskite structure as, for example, in the titanates, tantalates, niobates, zirconates, etc. Consideration is given to interesting special cases of the generalized results.

ISSN:0002-9505    

DOI:10.1119/1.1933748

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933749

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

A discussion is made of the errors involved in the use of a spherometer, and it is shown that the accuracy is limited by the accuracy with which the radius of the base circle is measured. A suggested change in design is given, which promises to mean easier manufacture and higher accuracy.

ISSN:0002-9505    

DOI:10.1119/1.1933750

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

An experiment is described wherein the dielectric constant of air is measured in a student laboratory. By using a beat frequency method, rather than a direct comparison, precisions of the order of 0.01 percent to 0.001 percent are obtainable with ordinary equipment. Important instructional features of the experiment are mentioned.

ISSN:0002-9505    

DOI:10.1119/1.1933751

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

Some of the optical properties of biaxial crystals are reviewed. Particular attention is given to the shapes of the wave surfaces and to the fact that true conical refraction cannot be observed.

ISSN:0002-9505    

DOI:10.1119/1.1933752

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP

摘要:

An elementary discussion of the Abbe theory of microscopic vision is given, suitable for teaching purposes. The effect of the phases in the back focal plane of the objective is briefly outlined. The consequence of limiting the aperture of the system in this plane is shown to be an image marred by diffraction.The relationship to Fourier's theorem having been indicated, the Gibbs phenomenon is next described. A standard formula for the finite sum of a Fourier series is taken and adapted to the case of imaging a suitable grating with a microscope objective limited by a slit aperture. If the grating slits are very narrow compared with the opaque region separating them, the image of each is shown to be marred by a set of fringes, due to the Gibbs phenomenon, exactly equivalent to the diffraction fringes from the single slit in the microscope objective.

ISSN:0002-9505    

DOI:10.1119/1.1933753

出版商:American Association of Physics Teachers    

年代:1954

数据来源: AIP