7A10.16 - Photoelectric Effect with Neon Lamp

Photoelectric effect with neon lamp

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PIRA Classification: 7A10.16

Description: A DC power supply is connected to a neon bulb and the voltage is set to 62 V (it will not glow as the firing voltage of the bulb ~70 V). When a purple laser shines on the plates of the bulb, the bulb will start to glow (and remain glowing as the bulb will stay lit down to ~55 V) due to the flow of electrons off of the plate. A green laser pointer will have insufficient energy to cause the lamp to glow. However, if the voltage is increased to 67 V, the green pointer will light the lamp.

Special Instructions: None

Condition: Good

Setup time: 2 minutes

Safety Issues: None