Photoelectric Effect

A grounded mercury lamp with a removable UV filter is set up across from a zinc plate. The potential of the zinc plate is measured with an electroscope that can be viewed by the class through the overhead projector. When the zinc plate is charged using a charging rod, the light from the lamp will slowly dissipate the charge on the plate. This process can be stopped at any time by inserting the UV filter in front of the mercury lamp.

References: Giancolli, Chpt. 40, Fig. 40-3

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