7A10.32 - Photoelectric Effect Stopping Potential

Code Number:
Demo Title:
Photoelectric Effect Stopping Potential
Photoelectric Effect
Area of Study:
Modern Physics
Variac, Voltmeter, 40 Watt Light Bulb or Mercury Vapor Lamp, Pasco Photoelectric Head, Colored Filters, and Neutral Density Filter.

Connect the photoelectric head to the voltmeter and place the light bulb a few inches in front of the head input slit.  Turn on the light bulb to a desired intensity and observe the stopping voltage.  Insert the filters and again observe the stopping voltage for each filter.  The stopping voltage should be higher toward the blue end of the spectrum.  The neutral density filter may be used to show that the stopping voltage does not depend upon intensity.

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Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.