Describes experiments and apparatus used to study the interaction of falling water drops on water surfaces and the collision between pairs of drops. (SL)

Describes an experiment for determining the blackbody radiation constant hc/k, utilize a conventionally built cavity and a single-beam, single-window Perkin-Elmer 12-C model spectrometer. (SL)

Described is an advanced undergraduate physics laboratory experiment for determining an area, and bandwidth-independent parameter, D* ("dee star"), of an infrared detection devices' detectivity. (SL)

Described is a physics experiment in which small bits of metal on a water surface will move towards, and away from an electrostatically charged rod. The explanation for the motion of the metal bits deals with their shape and the electrical force on the water surface. (SL)

Describes an experiment designed to provide the opportunity for studying some of the parameters affecting the stability of Vitamin C in various environments, and to acquaint the student with an experimental procedure for studying simple reaction kinetics and the calculations of specific rate constants. (Author/JR)

Reviews the Hafele-Keating experiment on relativistic changes in eastward and westward moving cesium atomic clocks. Recommends the use of the Sagnac effect to remove the east-west time asymmetry and of the general-relativistic effect to elucidate the clock-rate changes. (CC)

Describes a microbiological experiment designed to study the competition between two species of bacteria. Experimental procedures and data obtained in conducting this experiment are provided, together with a discussion of the results. (JR)

Provides description of an activity in which students synthesized sulfanilamide or sulfathiazole, II. The drug was then used as a chemotherapeutic agent. (RH)

A practical magnetotropism experiment with seeds is presented. The procedures, needed controls, and observations of results are described. (DF)

The ratio of electronic charge to Boltzmann's constant can be easily determined by measuring the short-circuit collector current versus the emitter-base voltage characteristic of a silicon transistor connected in the common-base mode. (Author/DF)