Plancks Constant Experiment

Determination Of Planck's Constant And Work Function Of Materials By Photoelectric Effect.

The Apparatus Consist Of The Following :

• Photo Sensitive Device : Vacuum Photo Tube.
• Light Source : Halogen Tungsten Lamp 12v/35w.
• Colour Filters : 635nm, 570nm, 540nm, 500nm & 460nm.

Accelerating Voltage : Regulated Voltage Power Supply

• Output : (+-)5V Continuously Variable Through Multi-Turn Pot
• Display: 3 1/2 Digit 7-Segment Led
• Accuracy: (+-)0.2%

 

Current Detecting Unit : Digital Nanoammeter It Is High Stability Low Current Measuring Instrument:

• Range : 1000 Microa, 100 Microa, 10 Microa & 1 Microa With 100% Over Ranging Facility
• Resolution : 1na At 1 Microa Range
• Display: 3 1/2 Digit 7-Segment Led
• Accuracy: (+-)0.20

Power Requirement : 220v (+-) 10%, 50hz

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 Filters, A Focus Lense Is Fixed In The Back End.