Schematic diagram of apparatus
1 Light source, 2 Base rail, 3 Scale, 4 Receiver cover (or filter), 5 Receiver tube, 6 Focusing lens, 7 Vacuum phototube, 8 Receiver box, 9 Digital meter (V or I), 10 Display mode switch (V or I), 11 Current multiplier, 12 Light intensity adjust, 13 Accelerating voltage adjust, 14 Voltage polarity switch, 15 Power switch, 16 Power indicator, 17 Lock screw
Features
Complete apparatus
Compact and stable
Low dark current
Affordable
Introduction
This LEAI-50 Experiment Apparatus of Planck's Constant is used to demonstrate photoelectric effect and calculate Planck’s constant according to Einstein’s equation of photoelectric effect. It is a cost-effective teaching apparatus for physics laboratories at colleges and universities. The instruction manual contains experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.
Specifications
| Description | Specifications |
| Cut-off wavelengths of color filters | 635 nm, 570 nm, 540 nm, 500 nm, 460 nm |
| Light source | 12 V/35 W Halogen Tungsten lamp |
| Sensor | vacuum phototube |
| Dark-current | less than 0.003 µA |
| Precision of accelerating voltage | less than ± 2% |
| Measurement error | approximately ± 10% as compared with literature value |
Parts List
| Description | Qty |
| Main unit | 1 |
| Filters | 5 |
| Power cord | 1 |
| Instruction manual | 1 |
Schematic diagram of apparatus
1 Light source, 2 Base rail, 3 Scale, 4 Receiver cover (or filter), 5 Receiver tube, 6 Focusing lens, 7 Vacuum phototube, 8 Receiver box, 9 Digital meter (V or I), 10 Display mode switch (V or I), 11 Current multiplier, 12 Light intensity adjust, 13 Accelerating voltage adjust, 14 Voltage polarity switch, 15 Power switch, 16 Power indicator, 17 Lock screw
