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Millikan's oil drop experiment

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  1. 1. Millikan’s Oil Drop Experiment(1909)<br />Nathan Breidenbach<br />Clemson University<br />
  2. 2. What is the charge of an electron?<br />Rutherford’s Gold Foil findings<br />JJ Thompson’s discovery of an electron<br />Charge/mass ratio known<br />
  3. 3. video<br />
  4. 4.
  5. 5. Experimental<br />E, applied electric field force<br />W, weight of drop<br />r, radius of drop<br />n, viscosity of the air<br />V1, terminal velocity when drop allowed to fall<br />V2, terminal velocity when higher electric field causes drop to rise <br />qE – W = 6πrnv2 = W * v2/v1<br />
  6. 6. Results and Discussion<br />Plate separation 0.016 m<br />Voltage across the plates 5,085 V<br />Distance of fall 1.021x10-2 m<br />Viscosity of air 1.824x10-5 N s/m2<br />Density of oil 0.92x103 kg/m3<br />Density of air 1.2 kg/m3<br />Average time of fall (no field) 11.88 s<br />Successive times of rise (with field) 1. 22.37 s<br />2. 34.80 s<br />3. 29.25 s<br />4. 19.70 s<br />5. 42.30 s<br />
  7. 7. Conclusions<br />Helped give more accurate values (ex: Avogadro’s Number) <br />Controversy over data used<br />Charge of electron has changed slightly since<br />