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
- 1x Basic Photoelectric Effect Apparatus (SE-6614)
- 1x DC Current Amplifier (SE-6621)
- 1x DC Power Supply I (Constant Voltage) (SE-6615)
CAUTION: UV LIGHT
Avoid eye & skin exposure. Wear proper eye & skin protection.
|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|
|Photoelectric Tube with Box Plate||SE-6612|