Advanced LED Array (Planck’s Constant)

With the Advanced LED Array (Planck’s Constant), teachers can discuss diffraction and the relationship between wavelength and color in light. In addition, Planck’s constant can be calculated while introducing several of the underlying principles of semiconductors (e.g., p-n junctions, bandgaps). The activation voltage (Va) of each LED can be measured, which is proportional to the energy of the emitted photons and thus inversely proportional to each LED’s wavelength. From these measurements, Planck’s constant is determined.

Description

With the Advanced LED Array (Planck’s Constant), teachers can discuss diffraction and the relationship between wavelength and color in light. In addition, Planck’s constant can be calculated while introducing several of the underlying principles of semiconductors (e.g., p-n junctions, bandgaps). The activation voltage (Va) of each LED can be measured, which is proportional to the energy of the emitted photons and thus inversely proportional to each LED’s wavelength. From these measurements, Planck’s constant is determined.

The array features 11 vertically stacked LED lights attached to a base with power switch, 2 power inputs, and LED common terminal input. Use this array to supplement investigations for Physics 2, the Particle Model of Light. It also can be an excellent introduction to Planck’s constant for chemistry students. The included instructions provide the LED wavelengths, or use a spectroscope to determine. DC power supply is needed but not supplied. Dimensions: base, 4-13/16 x 7-3/4″; metal array, 12-3/4″ H; base plus array, 14″ H.

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