Presents laser demonstrations of the surface photoelectric effect and the measurement of the laser beam wavelength; recommended for teaching the relationship between light energy and wavelength. (MLH)

This book, part of The Exploratorium science "snackbook" series, explains science with a hands-on approach. Activities include: (1) "3-D Shadow"; (2) "Bits and Bytes"; (3) "Circuit Workbench"; (4) "Diamagnetic Repulsion"; (5) "Film Can Racer"; (6) "Fractal Patterns"; (7) "Hoop Nightmares"; (8) "Hydraulic Arm"; (9) "Hyperbolic Slot"; (10) "Light…

A power mechanics program that's more than just auto mechanics. (Editor)

Reported are designs for a colorimeter (absorptiometer) and polarimeter, both of which may be constructed readily with average workshop facilities and whose performance is superior to many commercial instruments commonly used in teaching laboratories. Includes pertinent diagrams, operating instructions, and sample output. (JN)

Provides a detailed, non-mathematical analysis of total internal reflection based on the interaction of light and matter and the principle of superposition. Discusses factors affecting the critical angle and the percent of the incident beam that is refracted and reflected. (JM)

Examination of selected material from the history of science can provoke a number of questions about the nature of that activity as indicated in part 1 (SE 533 400). Presented here are some guidelines to help teachers discuss the observation statements and kinds of questions raised in part 1. (JN)

In response to a question, "Why not use a magnetic or electric field to deflect light?," reviews the relation between electric charge and electric/magnetic fields. Discusses the Faraday effect, (describing matter as an intermediary in the rotation of the place of polarization) and other apparent interactions of light with electric/magnetic fields.…

To discover how misconceptions occur and how teachers deal with them when they occur, fifth-grade students (N=229) and teachers (N=14) were observed during units on light and photosynthesis. Results suggest that curriculum developers consider childrens' misunderstandings of phenomena and design materials explicitly contrasting these…

Spatial filtering, based on diffraction/interference of light waves, is a technique by which unwanted information in a picture ("noise") can be separated from wanted information. A series of experiments is described in which students can create a system that functions as an optical computer to create clearer pictures. (Author/JN)

Describes an apparatus used to demonstrate effects observed with polarized light. The apparatus employs two pendulums attached to threads crossing orthogonally over an overhead projector. Several demonstrations using the apparatus are provided. (Author/JN)

An experimental technique to develop inferential thinking in less scientifically-oriented community college students is described. Students activate unlabeled gas discharge tubes and identify the gases by comparing color photographs with spectrometer observations. Includes methods for taking color photographs of spectra. (SK)

Presented is one of a series of articles designed to help science teachers keep current on ideas in specific areas in biology. Contained is information on how plants use light for growth, seed germination, and flowering. (PB)

The Einstein-Hopf model for the thermodynamic equilibrium between the electromagnetic field and dipole oscillators is considered within the framework of quantum mechanics. Both the wave and particle aspects of the Einstein fluctuation formula are interpreted in terms of the fundamental absorption and emission processes. (Author/SK)