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
The LEAI-50 Apparatus is designed to demonstrate the photoelectric effect and calculate Planck's constant using Einstein's equation of the photoelectric effect. This cost-effective teaching tool is ideal for physics laboratories at colleges and universities, providing students with hands-on experience in one of the fundamental experiments in modern physics.
Through this experiment, students can observe the photoelectric effect firsthand, where light strikes a metal surface and releases electrons, and use the data to calculate Planck's constant, a key constant in quantum mechanics. The apparatus is specifically designed for teaching purposes, ensuring a practical and efficient learning experience.
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
