摘要:

The issue of how to assess learning is addressed in the context of an investigation of student understanding of the work-energy and impulse-momentum theorems. Evidence is presented that conceptual and reasoning difficulties with this material extend from the introductory to the graduate level and beyond. A description is given of the development of an instructional sequence designed to help students improve their ability to apply the theorems to real motions. Two types of assessment are compared. The results demonstrate that responses to multiple-choice questions often do not give an accurate indication of the level of understanding and that questions that require students to explain their reasoning are necessary. Implications for the preparation of teaching assistants are discussed.

ISSN:0002-9505    

DOI:10.1119/1.18836

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

摘要:

This paper describes an instrument based on Busch’s method of determininge/mfor electrons. A square-wave deflection voltage is used for deflecting an electron beam. With this instrument, one can more easily and more accurately determinee/mfor the electron. A comparison is made experimentally and theoretically among several ways of deflecting an electron beam.

ISSN:0002-9505    

DOI:10.1119/1.18837

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18838

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP

ISSN:0002-9505    

DOI:10.1119/1.18839

出版商:American Association of Physics Teachers    

年代:1998

数据来源: AIP