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Physics Hvitfeldtska Gymnasiet 28th of March, 2004 IB 3 Oleg Kim Laboratory Report: Photoelectric effect Research problem: investigate aspects of photoelectric effect with different metals and lights Hypothesis: signs of photoelectric effect would be present as photoelectric effect is commonly intrinsic for metals Variables: independent: type of metal, type of light, light intensity, distance between light source and metal dependent: current magnitude controlled: temperature, pressure Apparatus and materials: zinc plates, copper plates, ultraviolet light, light bulbs, power source, ammeter, voltmeter, coulombmeter, sandpaper, wires, crocodile clips, caesium-antimony photocathode Method for the control of variables: the temperature and pressure are kept constant throughout the experiment; the experiment is conducted within a reasonably short period of time Method for the collection of sufficient relevant data: This is the experimental setup: Photons of UV light should knock electrons off from the plate 2. Plate 2 then becomes positively charged. Electrons reach plate 1 and it becomes negatively charged. Electric potential is thus established in the circuit between plates 1 and 2 which induces the flow...

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