Phosphorescence - Black Light And Oscilloscope

Purpose

Demonstrate phosphorescence.◙

Equipment

Black light and oscilloscope CRT.◙

Images

p3-64

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.