PURPOSE: Demonstrate phosphorescence.
DESCRIPTION: An ultraviolet light illuminates the face of an oscilloscope tube, causing it to glow a bright green color. When the black light is removed, the tube screen still glows, demonstrating its phosphorescence. This effect is important in avoiding flickering when an oscilloscope or a TV set is viewed.
REFERENCES: (PIRA unknown.)
EQUIPMENT: Black light and oscilloscope CRT.
SETUP TIME: None.
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