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PURPOSE: To demonstrate that light obeys the inverse square law.
DESCRIPTION: The intensity of the bulb as a function of distance can be measured by a radiometer, verifying the inverse square relationship. The radiometer reading is displayed using an overhead projector slave meter.
SUGGESTIONS: See Question of the Week #316 for information on using this demonstration to enhance class involvement. This question uses a slightly different setup.
REFERENCES: Available. (PIRA 6B10.20)
EQUIPMENT: 150 watt point source, radiometer, 10VDC projection slave meter, two-meter optical rail.
SETUP TIME: 15 minutes.
