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Plancks Constant Experiment Manufacturer,Supplier and Exporter in India

Product Code : EL-AS-10837

Product Description

An interesting way to establish Planck's Constant, the experiment is complete and self-contained, presented in a battery-powered instrument case.

There are 5 LEDs of wavelengths 430, 565, 595, 620 and 660nm.

A rotary switch selects 1 of the LEDs, viewable through holes in the sloping front panel.

By adjusting the potentiometer, the voltage across the selected LED is raised until photon threshold is reached, shown by the LED just beginning to glow.

The voltage across the LED is displayed on the built-in digital voltmeter, from which electron energy (and hence photon energy) can be calculated.

At the threshold it is assumed that all electron energy released in re-combination is converted entirely to photon energy (any higher and phonon energy is is involved).

Knowing the energy and the characteristic wavelength of the LED (indicated on the case), Planck's Constant can be determined.

Please note this requires a PP3 battery .

LED Wavelengths:

430nm

565nm

595nm

620nm

660nm

Further Information

Curriculum Link	Atomic Physics & Radiation
Product Type	Planck's Constant Unit

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