摘要:

The Bloch-Sommerfeld theory of conductivity is applied to the calculation of momentum lost by conduction electrons because of collisions with the crystal lattice. The momentum lost by the conduction electrons, suitably averaged, is interpreted as a force per unit volume acting on the crystal lattice. The calculations provide the basis for a microscopic interpretation of the ponderomotive forcef = (1/c)(j×H)per unit volume.In the case of metals which conduct in a single band, the ponderomotive forcefis produced entirely by the action of the Hall electric field on the crystal lattice. When conduction takes place in more than one bandfis partially caused by the action of the Hall electric field on the crystal lattice and partially caused by collisions of conduction electrons with the lattice.

ISSN:0002-9505    

DOI:10.1119/1.1933126

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

摘要:

After performing nine standard experiments, the student chooses a project from a list of eleven for which the department has the necessary apparatus. Some of these projects require independent thinking and planning; others require only intelligent and selective use of printed references. Three men ordinarily work together, planning and executing their project in four weeks, with minimum help from the instructor. Each team hands in a written final report and may make an oral progress report to the class. Surprising enthusiasm is generated, and much is learned about the management of a small research project. A list of project titles appears in this paper.

ISSN:0002-9505    

DOI:10.1119/1.1933127

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933128

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933129

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933130

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933134

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933137

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933138

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.1933139

出版商:American Association of Physics Teachers    

年代:1952

数据来源: AIP