Used in the “Optics” section to observe the photoelectric effect and determine the Planck constant. Consists of a 230 V / 50 Hz ultraviolet radiation source and three plates (zinc, copper and metal mesh in a frame) with dimensions sufficient to block the "&"radiation flux, but not less than 80 x 80 mm. Each plate is fixed in a dielectric stand with terminals for connection to a power source. The emitter has a special nozzle for directing the UV radiation flux onto the plates.
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