Quick Answer: Plancks Constant is an apparatus with a phototube and a control unit with built-in voltmeter and nanoammeter, used with three included LEDs of known wavelength to study the photoelectric effect and calculate Planck's constant.
Last updated: October 2026
Key Features
Phototube and control unit with built-in voltmeter and nanoammeter
3 LEDs of known wavelength included: green, red and blue
LED light adjustment 0-100% and anodic tension adjustment
Button to cut off current; 24 V d.c. power supply included
Comprehensive teacher guide with notes on the photoelectric effect and Planck's work
Technical Specifications
Specification
Value
Voltmeter
4 digits, sensitivity 2 mV
Ammeter
4 digits, sensitivity 5 nA
LED light adjustment
0-100%
Power supply
24 V d.c.
LEDs
Green, red and blue
Weight
Control station 370 g; phototube base 560 g
About This Product
The apparatus relates the energy of emitted electrons to the wavelength of the incident light from each LED, and Planck's constant can then be calculated approximately using the Planck-Einstein relation. Supplied as a Planck constant experiment kit, it also supports exploring basic quantum mechanics, with notes that explain the theory alongside the experimental methods.
Frequently Asked Questions
Q1. Which LEDs are supplied? Three LEDs of known wavelength are included: green, red and blue.
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