The concept that the stopping voltage does not change with light intensity is tested using the various apertures that change the light intensity by partially blocking the light. the frequency, and Planck’s Constant is determined from the slope of the graph. The voltage is then adjusted to stop the photoelectric current. The metal plate in the photodiode is illuminated with various frequencies of light, selected from a mercury lamp using filters. ![]() This apparatus uses the conventional method of determining Planck’s Constant. ![]() The Photoelectric Effect System is used to perform the photoelectric experiment, determining Planck’s Constant to within 5%.
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