Five Selectable Monochromatic Wavelengths
The apparatus uses narrowband filters to select mercury spectral lines at 365, 405, 436, 546, and 577 nm. These defined wavelengths allow students to compare the photoelectric response at different light frequencies and provide the data required for Planck constant determination.
Adjustable Incident Light Intensity
Three interchangeable apertures with diameters of 2 mm, 4 mm, and 8 mm are provided to change the amount of incident light reaching the phototube.
This enables students to study the relationship between light intensity and photocurrent while keeping the incident wavelength unchanged.
High-Sensitivity Photocurrent Measurement
The integrated measurement system detects currents from 10⁻⁸ to 10⁻¹³ A, supporting the weak photocurrent measurements required in photoelectric effect experiments.
Stable and Adjustable Optical Setup
The mercury lamp and phototube are mounted on a 600 mm optical track, providing a stable experimental arrangement while allowing the source-to-detector geometry to be adjusted when required.
Integrated Experimental Design
The wavelength filters, apertures, phototube, optical track, and electrical measurement components are integrated into a complete teaching system, helping reduce setup complexity for university physics laboratories.
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