7 Quantum Physics 7.3 Millikan experiment
P2510100
Elementary charge and Millikan experiment
Measurements on various droplets for determining the elementary charge by the Millikan method.
Principle Charged oil droplets subjected to an electric field and to gravity between the plates of a capacitor are accelerated by application of a voltage. The elementary charge is determined from the velocities in the direction of gravity and in the opposite direction. Tasks 1. Measurement of the rise and fall times of oil droplets with various charges at different voltages. 2. Determination of the radii and the charge of the droplets. What you can learn about ▪ ▪ ▪ ▪ ▪
Electric field Viscosity Stokes' law Droplet method Electron charge
Main articles Millikan apparatus Power supply, 0...600 VDC Multi-range meter w.overl.prot. Polarity Switch for Millikan Apparatus Tripod base PHYWE Stop watch, interruption type Stand tube Object micrometer 1mm i.100parts Circular level, d = 36 mm
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excellence in science 192
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Robert A. Milikan 1923, Nobel Prize in Physics