Planck'S Constant Apparatus Advanced Model

The Apparatus consist of the following : 6 1. Photo Sensitive Device : Vacuum photo tube. 2. Light source : Halogen tungsten lamp 12V/35W 3. Colour Filters : 635mm. 570nm, 540nm, 500nm & 460nm. 4. Accelerating Voltage : Regulated Voltage Power Supply. Output : ±15V continuously variable through multi-turn pot Display : 3½ digit 7-segment LED Accuracy : +0.2% Power Requirement : 220V± 10%, 50Hz or 110V± 10%, 60Hz as required. 7.