Planck constant using photoelectric effect

Description

THE APPARATUS CONSIST OF THE FOLLOWING :

1. Photo Sensitive Device : Vacuum photo tube.
2. Light source : Halogen tungsten lamp 12V/35W.
3. Colour Filters : 635nm, 570nm, 540nm, 500nm & 460nm.
4. Accelerating Voltage : Regulated Voltage Power Supply,
5. Current Detecting Unit : Digital Nanoammeter: 1000 mA,100 mA, 10 mA & 1mA with 100%,over ranging facility,Resolution: 1nA at 1 mA range Display: 3½ digit 7-segment LED,
6. Power Requirement : 220V ± 10%, 50Hz.
7. Optical Bench : The light source can be moved along it to adjust the distance between light source and phototube scale length is 400 mm. A drawtube is provided to install colour filter, a focus lense is fixed in the back end.

The set is complete in all respect, no additional accessory required.