A discussion of the strangeness quantum number is used to introduce the problem of discovering a universal law of weak interactions. Progress made in this area and some suggestions as to future developments are briefly described. (TS)

The properties of the weak force between the subatomic particles is described. The weak force is observed in the form of nuclear beta radioactivity. Applications are given to terrestrial and extraterrestrial phenomena. (TS)

Presents the history, current concerns and potential developments of nuclear fusion as a major energy source. Controlled fusion research is summarized, technological feasibility is discussed and environmental factors are examined. Relationships of alternative energy sources as well as energy utilization are considered. (JM)

Discusses areas of modern astronomy that owe their development largely to nonoptical radiation: radio, infrared, ultraviolet, and x-ray radiation. Indicates new observations favor the big-bang" model of the universe, for it is now established that the earth is expanding at a measurable rate. Annotated bibliography. (LS)

Presents a research project for secondary school students in the fields of archaeophysics (archaeology) and geophysics using gamma spectroscopy. Describes investigations in mineralization and in dating of potsherds. (LS)

Cerenkov counting is a useful technique for assaying medium/high energy beta emitters in aqueous solutions. Advantages of the technique include: (1) simple sample preparation; (2) being able to handle large volume of aqueous solution for counting; and (3) absence of chemical quenching. Cerenkov counting is also less expensive than other methods.…

Suggesting that selected research activities be integrated into engineering technology programs to give students experiences in new technology, this article discusses a project incorporating teaching, research, and service. A photograph and description of the solar experiment unit resulting from the project are provided. The unit runs on air,…

Points out textbook errors or discrepancies which are confusing or unclear in describing the photon. Cites specific texts and the particular point of confusion in each one. (JM)

Presents an undergraduate laboratory experiment in which a solar collector is used to heat water for domestic use. The working fluid is moved by natural convection so no pumps are required. Experimental apparatus is simple in design and operation so that data can be collected quickly and easily. (Author/JN)

Discusses problems associated with the use of nuclear power as a source of energy. Sources of exposure to radiation, the effects of exposure to radiation on children's health, and safe alternatives to nuclear power that can be taught to children are among the topics addressed. (Author/RH)

Selected infrared laser chemistry topics are discussed including carbon dioxide lasers, infrared quanta and molecules, laser-induced chemistry, structural isomerization (laser purification, sensitized reactions, and dielectric breakdown), and fundamental principles of laser isotope separation, focusing on uranium isotope separation. (JN)