Planck’s Constant

Modern LEDs (light emitting diodes) cover the range from deep blue to infra-red. By monitoring the voltage at which each LED just begins to emit light a graph of energy input as a function of light emitted frequency can be plotted and an approximate value of Planck’s constant deduced. The system is an excellent illustration of modern electronics and gives a good investigation into a difficult topic in Post-16 physics. The LEDs are mounted in a self-contained box with voltage control and monitoring points for current and voltage. A protection resistor is included to prevent damage to the LEDs. Complete with viewing tube but without power supply which should be approximately 5 V d.c. from any laboratory source.

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SKU: S600-020E Category:

Additional information


L x W x H: 260 x 145 x 100 mm


0.490 kg

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