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Electrons and Quantum Mechanics - Oakland Schools

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Demonstration 6: Simple Mass Spectroscopy<br />

Materials<br />

Overhead projector<br />

Sheet of Plexiglas, 8-1/2 x 11 in<br />

Magnet, disk shape, 3-4 in diameter<br />

3-4 Steel ball bearings of various sizes<br />

Procedure<br />

1. Form a shallow inclined plane with the Plexiglas sheet on top of the overhead<br />

projector, by using a small block of wood or other material to elevate one end of the<br />

sheet.<br />

2. Insert the magnet underneath the center of the inclined plane.<br />

3. Roll the steel balls down the incline. If they are rolled near but not over the magnet<br />

(they will stop) their direction of motion will be altered. The smaller ball bearings will be<br />

deflected through a greater angle than the larger ones.<br />

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