KE6789 LED for Determination of Planck's Constant,

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For determining Planck's constant h by measuring the diffusion potential of differently colored LEDs as a function of the wavelength or frequency.

Six colored LEDs of different emission wavelengths with integrated series resistor mounted on carrier plate with shaft. Wavelengths: 480 nm, 560 nm, 590 nm, 635 nm, 655 nm 950 nm Series resistor: 100 �, 1% Voltage: max. 6 V Dimensions: 115x115 mm Weight: approx. 120 g