8:00 DETERMINING PLANCK'S CONSTANT FROM THE PHOTOELECTRIC EFFECT USING LEDs AND LASERS AS LIGHT SOURCES, Max F. Heres *, Bob Powell and Robert Moore, Jr., Department of Physics, University of West Georgia, Carrollton, GA 30118. A widely-used experiment for upper level laboratory experiments is the determination of Planck's constant via the photoelectric effect. The Daedalon EP-05 Photoelectric Effect Apparatus was used for the required measurements of the stopping voltage versus wavelength using selected wavelengths of light from various sources. In this study, six light emitting diodes (LEDs) (660nm. 605nm. 595nm, 524nm. 470nm. 400nm) and four lasers (633nm, 612nm, 594nm. 544nm) were used as light sources. Planck's constant determined with the LED sources had an average percent error of less than 0.3% compared to 1.3% for the laser sources, for which there were fewer sources and no sources at the short wavelengths. While LED's do not have as narrow a spectral profile as do lasers, they are still excellent sources for discrete wavelengths, yield excellent results for the photoelectric effect, and much less expensive than lasers. 8:15 EFFICIENCY INVESTIGATION ON ELECTROLYTIC GEOMETRY AS A FUNCTION OF FLUIDITY FOR PUMP-ABLE BATTERIES **, Max F. Heres *, Matthew Bishop *, Bob Powell and Robert Moore, Jr., Department of Physics, University of West Georgia, Carrollton, GA 30118. Conventional battery technologies have limited geometric configurations and require multiple hours for recharging. The pump-able exchange of the electrolytic materials as a means of near instantaneous recharging is the basis of this investigation. The efficiency investigation was conducted by placing uniform electrolytic particulates in a containment chamber with a chemically permeably membrane as the dividing barrier between the anode and cathode, all of which were set in an ion transfer solution. A co-investigation was conducted using MatLab computational software to analysis the optimal geometry of the electrolytic materials as a function of the fluidity of the system in pump exchange.