Photoelectric Effect System

Product Code: SE-6609


The Photoelectric Effect System uses the conventional method to determine Planck’s Constant within 5%. First, the metal plate in the photodiode is illuminated by various light frequencies; selected from a mercury lamp with filters. Then, the voltage is adjusted to stop the photoelectric current. The stopping voltage is then plotted against the frequency, and Planck’s Constant is determined using the slope. Students can test whether the stopping voltage changes with light intensity using the various apertures and corresponding light intensities.

How it Works: The filters and the apertures are built into the front of the photodiode case, making it easy to clean and eliminating the need for a separate storage box. To change the aperture size, simply pull outward on the aperture ring and rotate it to a different aperture. The filter wheel rotates independently of the aperture ring to select different frequencies of light. The wheel clicks into place, assuring that the filter is aligned with the aperture.

Perform These Experiments

  • h/e Experiment
  • Experimental Determination of Planck’s Constant
  • Measuring Current-Voltage Characteristics

What’s Included


Avoid eye & skin exposure. Wear proper eye & skin protection.

Product Specifications

Current Amplifier Measuring Range 10−8 to 10−13 A in six ranges
Photoelectric Tube Voltage Adjustment –4.5 V to 0 V and –4.5 V to +30 V (two ranges)
Photoelectric Tube Spectral Response Range 300 nm – 700 nm
Photoelectric Tube Anode nickel ring
Five Optical Filters with Central Wavelengths 365.0, 404.7, 435.8, 546.1, and 578.0 nm

Buying Guide

Replacement Parts P/N
Photoelectric Tube with Box Plate SE-6612