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 a dynamical system which is stable at potential maxima. The maxima, called L-4 and L-5, are stable locations of the restricted three-body problem. Energy loss from the system will tend to drive it away from stability. (GA)

Explains how videotape technology has been used in physics instruction, and that the original design which was intended for independent and self-paced instruction has been broadened to include other areas. (GA)

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

Explains the methods for reducing organic compounds using new reagents and shows their usefulness and selectivity. (GA)

Describes a first-year zoology course at University College Cardiff based on a self-instructional system using printed texts, audiovisual programs, and integrated practical work. (Author/BB)

Describes a method for teaching the technique of nearest-neighbor frequence analysis (NNFA) for testing the fidelity of template DNA replication. (Author/BB)

A FORTRAN program is described which simulates point-substitution mutations in the DNA strands of typical organisms. Its objective is to help students to understand the significance and structure of the genetic code, and the mechanisms and effect of mutagenesis. (Author/BB)

This article discusses errors in the presentation of valence theory in undergraduate chemistry textbooks, and the resulting misunderstandings in the minds of many students. Particular emphasis is given to the explanation of the trend in ionization energies along the first row of the periodic table. (BB)

Discusses some basic principles regarding why a certain inorganic element (compound) is specifically required for a certain function in biological systems. (HM)

Describes a device for maintaining the proper water level in knife boats during ultramicrotomy. Water levels in troughs are adjusted rapidly and precisely during the cutting process. Illustrations are included. (Author/MA)

Describes an experiment which studies the motion of an irregular Lucite glider on an air table and demonstrates the dynamic properties of the center of mass. (Author/GA)

Describes an experiment which utilizes the technique of double-exposure holographic interferometry to demonstrate electromagnetic wave radiation-pressure effects on an illuminated object. (Author/GA)

Describes an experiment, in solid-state physics, for measuring the Shubnikov-de Haas oscillations in indium antimonide. It also provides an introduction to low-temperature techniques and to cryomagnetic systems. (Author/GA)