C1.1.3.5 Determination of Elementary Electric Charge According to Millikan and Proof of Charge Quantisation

C1.1.3.5 Determination of Elementary Electric Charge According to Millikan and Proof of Charge Quantisation

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Determination of Elementary Electric Charge According to Millikan and Proof of Charge Quantisation

With his famous oil-drop method, R. A. Millikan succeeded in demonstrating the quantum nature of minute amounts of electricity in 1910. He caused charged oil droplets to be suspended in the vertical electric field of a plate capacitor and, on the basis of the radius r and the electric field E, determined the charge q of a suspended droplet:

He discovered that q only occurs as a whole multiple of an electron charge e.
In experiment C1.1.3.5, the electric field is calculated from the voltage U on the plate condenser at which the oil droplet is observed floating straight. To determine the radius, the constant sinking velocity v1 of the droplet is then measured with the electric field switched off. From the equilibrium between the force of gravity and Stokes’ drag, it follows that
Components of experiment:

 

1 559 412 Millikan apparatus
1 559 421 Millikan supply unit
1 313 033 Electronic time clock P
3 501 46 Connecting leads, 19 A, 100 cm, red/blue, pair

 

Additional information

Weight 15 lbs
Dimensions 42 × 36 × 24 in
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