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Planck's Constant Determination Box
(1) Determination Box
This apparatus is designed to determine the approximate value of Plancks constant using the elbow voltage in the characteristic curves of a number of LEDs. There are 7 LEDs covering from deep blue at 470 nm to near IR 940 nm mounted on the box with sockets for voltage and current measurements..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 approx value of Planck's constant can be deduced. External power supply for 9 volts is required or a 9 Volts battery with suitable connecting cords can also be used.
Started over 50 years ago as a small, family-owned manufacturing company, Eisco now produces over 6,500 product lines for the science education and scientific research markets. They have headquarters in both India and the US, and serve hundreds of distributors around the world.
Their core products include glassware, physics apparatus, biology models & equipment, and chemistry lab supplies. Products are designed by a team of laboratory professionals and engineers with quality and durability in mind.