May11 - Measured the terminal velocity. at terminal...

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Physics 2005…in 2009
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Coulomb’s Torsional Balance Auguste Coulomb
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BIG SURPRISE FOR RUTHERFORD: MOST PARTICLES WENT STRAIGHT THROUGH THE GOLD FOIL . Explaination: “much of the atomic volume was now assumed to contain only the very light electrons, which could not produce much deflection. Accordingly, many alpha particles would pass through the atom, deflected only slightly by the electrons and the long-range Coulomb interaction with the nucleus” How did mankind begin to find out about the atom?
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Milliken Gravity Electric force Oil first let oil drops fall until they reached terminal velocity.
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Unformatted text preview: Measured the terminal velocity. at terminal velocity the oil drop is not accelerating. So the total force acting on it must be zero, gravity+drag=0 , This lets us calculate the mass of each oil drop Finally, use an electric field to stop the falling then the force of Gravity is exactly cancelled by the electric force, which determines The charge. x How did mankind measure charge? Millikens actual drawing, he measured e=1.5924(17) x 10^19 coulombs which is a touch low, due to an error in the viscosity of air...
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May11 - Measured the terminal velocity. at terminal...

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