Discusses a small part of the final state of a high-energy neutrino interaction: a head-on collision of a positron and a stationary electron. Provides a bubble chamber picture and describes the resulting particle effects. Uses momentum to determine the mass of the positron. (MVL)

Describes a method for presenting Archimedes' principle of buoyancy to a physics class using helium-filled, Mylar balloons. Describes theory and includes typical data results. (LZ)

Presents a brief historical review and a discussion of the Bohr theory aimed at helping readers understand more completely the development of atomic quantum physics and comprehend more precisely and profoundly the essence of the correspondence principle. (JRH)

Describes a strategy for presenting ideas of atomic physics in the laboratory portion of the course before it is introduced during a lecture in order to give students an appreciation for the concepts involved, a historical look at how the field developed, and a comprehensive review of physics concepts. Presents a worksheet for the Bohr atom…

Discusses Newton's idea of predicting very high temperatures of objects by observing the time needed for the object to cool to some standard reference temperature. This article discusses experimental deviations from this idea and provides explanations for the observed results. (MVL)

Provides an example to develop critical thinking skills based on the presentation and analysis of spacecraft measurements of phenomena associated with the aurora. (MVL)

Discusses mathematical and physical evidence that air consists of a tiny volume of particles moving at an average speed of over 1000 miles per hour. (WRM)

Uses computers to aid in teaching one property of the chaos theory: sensitivity to initial conditions. Provides demonstrations that illustrate that science and physics do not and cannot have all the answers to questions asked regarding the causes of natural phenomena. (ZWH)

The purpose of this article is to indicate another way of looking at duality and to propose an alternative approach to the teaching of quantum theory at the introductory level. (MVL)

Describes and explains a procedure for photographing the chaotic scattering of light. (WRM)

Suggests ways to bring home to the introductory physics student some of the excitement of recent discoveries in particle physics. Describes particle detectors and encourages the use of the Standard Model along with real images of particle tracks to determine three-dimensional views of tracks. (MVL)

Studies the simple dynamical system of the pendulum and the chaotic behavior that occurs when the pendulum is both damped and driven. Provides an algorithm and BASIC program for the numerical solution to the differential equations encountered in the discussion. (MDH)

Discusses the early recognition of chaos as seen in Poincar's work solving dynamical problems. Proposes five examples from which an inventory of the manifestation of chaos can be inferred. Discusses some instructional consequences of the development of ideas of chaos. (MDH)