Planck's Constant Apparatus

Planck's Constant Apparatus

This apparatus is designed to determine the approximate value of Planck's constant using a range of LEDs of known wavelength to allow the electron photon energy to be calculated. There are 7LEDs covering the light range from deep blue at 470nm to near IR at 940nm, mounted on a box with 4mm sockets for attachment to a voltmeter and ammeter 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 approximate value of Planck's constant can be deduced. Requires a 9V d.c. power supply.

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