Describes a technique which enables the student to observe the relativistic behavior of electrons in a gamma ray detector and compare his results with the classical and relativistic predictions. Shows that it is possible to unambiguously determine the electron's momentum by knowing the Compton edge and photopeak energies of a gamma ray energy…

Presents an analysis of scientific theory which is applicable to the full range of historical situations. Indicates that theory can be resolved into three generalization levels, one neutral element, and two modes. Included are examples illustrating the constituency of the three levels in two modes. (CC)

A project on computer based dialogue for freshmen is described and evaluated. The dialogue utilizes a CAI language written in Fortran that allows a designer to easily write and edit questions at his own desk without the use of a terminal. (Author/DT)

Reports the results of a comparative evaluation of Harvard Project Physics (HPP) and non-HPP student performance, and demonstrates the ability of a new test construction paradigm to generate valuable feedback for curriculum developers, teachers, and students. (JR)

Summarizesundergraduate and graduate physics courses offered in 16 institutions in Scotland, involving course structures, branches of research, admission requirements and o ptional possibilities. The material is useful to physics teachers, career advisors, and students who are interested in the field. (CC)

Discusses the importance and difficulties of teaching basic quantum theory. Presents a discussion of wave-particle duality, indeterminacy, the nature of a quantized state of a system, and the exclusion principle. (MLH)

Presents two arguments concerning the role of the photon. One states that the photon is just another particle distinguished by a particular value of charge, spin, mass, lifetime, and interaction properties. The second states that the photon plays a fundamental role with a deep relation to ultimate formulas of physics. (GS)

Presents a summary and comparison of various views on the concepts of mass and weight. Includes a consideration of gravitational force in an inertial system and apparent gravitational force on a rotating earth. Discusses the units and methods for measuring mass and weight. (GS)

Describes an experiment in which the free-electron cyclotron resonance of electrons trapped in a microwave cavity by a Penning trap is observed. The experiment constitutes an attractive alternative to one of the Gardner-Purcell variety. (Author/GS)

Outlines the basic engine design and nomenclature, develops some relations between the state parameters of the rubber-band system, defines engine efficiency, and compares the Archibald engine with the Carnot engine. (GS)

Describes a one semester course in introductory stellar astrophysics at the advanced undergraduate level. The course aims to integrate all previously learned physics by applying it to the study of stars. After a brief introductory section on basic astronomical measurements, the main topics covered are stellar atmospheres, stellar structure, and…