Energy of Light, Plank’s Constant Module, Model 214

Model214
Voltage Range 0-4 V
LEDs Color
IR
IR
Red
Orange
Green
Green
Blue
Open
Wavelength
940 nm
880 nm
640 nm
602 nm
568 nm
502 nm
470 nm
User-selected
Power Supply 12 VAC power pack
MicroLab Input CAT-5 Input A, B or C

Our Energy of Light Module, Model 214, uses the bandgap energy of light emitting diodes to demonstrate the energy and color of light.  Students select an LED then increase the voltage until enough energy is supplied to initiate emission of light.  The applied energy forces electrons to jump the energy gap between the N (electron excess) and P (electron deficient) semi-conductor layers.  Students can explore, in a hands-on experiment, the relationship between energy, frequency and color.  A plot of the voltage required to turn the LED on versus wavelength will give a slope corresponding to Plank’s Constant.

MicroLab’s Atoms First Package includes the Energy of Light Module (Model 214) and the Visual Spectrometer (Model 141), and gives students the opportunity to explore spectra, atomic structure and atomic models—content not well supported by traditional “wet-lab” topics.  Because much of the time in these experiments involves computer analysis of data, two sets of students can share one set of data acquisition equipment.

Model214b