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This demonstration shows the photoelectric effect through the production of photoelectrons in zinc. When ultraviolet light is shown on a negatively charged zinc plate attached to an electroscope, the scope discharges.
* Equipment seen in the video may vary from equipment used in ND Demonstrations. See information and images below for ND equipment and setup.
Setup:
Place the electroscope, UV lamp, and rod with rubber on the demo table.
Shortly before the demo is done, clean the zinc plate with steel wool or sandpaper to remove the zinc oxide.
Attach the zinc plate to the electroscope.
Charge the electroscope using the rod and rubber.
Shine the ultraviolet light on the zinc plate. BE SURE NOT TO SHINE THE LIGHT AT ANYONE AS UV LIGHT IS DAMAGING TO HUMAN EYES!
Notes:
There is a slight delay with the lamp turning on.
A Plexiglas plate can be placed between the lamp and plate to show that it is the light causing the discharge.
A webcam may be setup to view the electroscope.
Courses Used In:
Coming Soon
Discussion and Polling Questions:
Coming Soon
Equipment Needed:
Electroscope
Zinc Plate
Ebonite Rod
Rubber
UVC Lamp
Webcam (optional)
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