Describes a physics course, Biomechanics, designed for physical education majors, where stroboscopic photography is used to provide student data to calculate average velocities of objects in different sport activities. (GA)

Science activities or experiments described are: (1) plant cloning, (2) determining the cost-effectiveness of gas and electric heating, and (3) a physics project competition. (MDR)

Proposes an alternative to the classical minimum-deviation method for determining the refractive index of a prism. This new "fixed angle of incidence method" may find applications in research. (Author/GA)

Presents a simplified theoretical analysis of the variation of quantum yield with photon energy in the photoelectric experiment. Describes a way to amplify the experiment and make it more instructive to advanced students through the measurement of quantum yield of a photo cell. (GA)

Describes an experiment that allows the student to estimate the diameter of the fovea in his own eye. (GA)

Two learning activities are presented to develop observation and classification skills at the elementary level. The first is an electric box that associates tree names with leaf and bark specimens, and the second is a pond water observation and slide preparation activity. (BB)

Describes the construction of an inexpensive, highly reliable, milli-degree temperature controller and differential thermometer from an extremely stable thermistor and other readily available materials. Actual construction time is relatively short for both devices. Illustrations are included. (Author/MA)

Derives the precessional period of a Foucault pendulum without using small oscillation amplitudes. Shows that if the path of the pendulum passes through the origin, the periods for differing amplitudes are essentially the same. (GA)

Describes an apparatus for investigating the behavior of photoelectrons in a uniform magnetic field in either a vacuum or a low-pressure gas. Presents data and discusses some basic features of the photoelectric effect and the diffusion of free electrons in a gas. (GA)

This article describes two simple undergraduate heat transfer experiments which may reinforce a student's understanding of free convection and radiation. Apparatus, experimental procedure, typical results, and discussion are included. (Author/BB)

Describes demonstrations of gaseous acid-base reactions and variations on traditional "clock" reactions. (SL)

Describes student projects involving the appearance of "ghost" signals in television receptions. (SL)

Two methods are described for the quantitative description of the motion of the sun as observed from Mercury. A listing of a computer subroutine is included. The combination of slow rotation and high eccentricity of Mercury's orbit makes this problem an interesting one. (BB)

Exercises for introductory to intermediate level college students are proposed. Observations of pulsars can be used to illustrate the phenomena of dispersion and Faraday rotation of radio waves, and to illustrate the differential rotation of the galaxy. (BB)

Detailed instructions for use in an undergraduate level course are provided. (CP)