Simple Planck Constant Practical Kit, 7 LED Set
$125.00(Ex GST)
- Low-cost Planck’s constant method
- 7 LED wavelength readings
- Includes 2 infrared LEDs
- Turn-on voltage measurement approach
- Graph plotting to determine h
- Description
Description
Planck’s Constant Apparatus, Simple, 7 LEDs provides a low-cost method for estimating Planck’s constant by measuring the photon energy of different light wavelengths. Instead of a traditional photo tube method that measures electron energy levels, this apparatus uses LEDs as the light sources and measurement elements.
How it works
A voltage is applied to each of the 7 LEDs and increased until the LED just begins to conduct. The turn-on voltage at the onset of current flow relates to the photon energy for that LED’s wavelength. Seven readings are taken, including 2 infrared LEDs, then the results are graphed in the standard way to determine Planck’s constant.
Why this method is used
This LED-based approach is not as fundamental as the photo tube method, but it produces good results at a much lower price, making it well suited to teaching labs that want a practical, repeatable Planck’s constant activity with simple measurements.
FAQs
Q: What is measured in this apparatus to determine Planck’s constant?
A: The voltage at which each LED just begins to conduct, taken for 7 LEDs of different wavelengths.
Q: How many LEDs are included, and are infrared readings included?
A: 7 LEDs are used, including 2 infrared LEDs.
Q: How are the results processed?
A: Seven readings are collected and a graph is plotted as normal to determine Planck’s constant.
Q: How does this compare to the traditional photo tube method?
A: The photo tube method measures electron energy levels and is more fundamental. This LED method is lower cost, and still produces good results.
Q: What makes this suitable for teaching labs?
A: It uses straightforward voltage readings across multiple LED wavelengths, then standard graphing to determine Planck’s constant.
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