7A10.10 Photoelectric Effect

7A10.10 Photoelectric Effect

Use UV light to discharge a clean zinc plate mounted on an electroscope.

7A10_10

Demo set up with a charged zinc plate

7A10_10_2

Charged zinc plate mounted on the electroscope

Note: Include a bright white light source and a laser to show that only the right wavelength of light works. Observe that if the mica filter is in place on the UV lamp, the zinc plate will not discharge.

Location: Zinc Plate: K2-2; UV pen light M1-2; Electroscope F2-2 (wooden stand); Battery Pack: Q1-3