- Instrument Description
This apparatus is designed for general physics experiments in higher education. It employs the deceleration field method to measure the cutoff voltage of photocathode materials under illumination by monochromatic light of different wavelengths, thereby verifying Einstein’s equation and determining Planck’s constant. This experimental process helps students understand the quantum nature of light and learn the experimental techniques and methods related to the photoelectric effect.
- Product Features
· 1. This experimental setup uses a monochromator to generate monochromatic light. It can continuously produce monochromatic light of different wavelengths, yielding more data and greater accuracy.
· 2. The inclusion of a monochromator allows students to gain a deeper understanding of its operating principles and calibration methods within a single experiment, enriching the experimental content.
· 3. The testing method employs the zero-crossing method. Compared to the human error introduced by the inflection point method, the zero-crossing method is simpler to operate and yields more accurate results.
- Experimental Content
1. Determine the voltage-current characteristic curve of the phototube
2. Plot the ν–U relationship curve
3. Calculate the following using graphical analysis or simple linear regression:
A. Planck’s constant h
B. The cutoff frequency ν of the photocathode material
C. The work function Ws
D. Verify Einstein’s equation
4. Measure the photocathode’s voltage-current characteristic curve under a positive voltage