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SAT, 17.02.2022 03:30 whitakers87

A xenon arc lamp is covered with an interference filter that only transmits light of 400nm wavelength. The transmitted light strikes a metal surface, a stream of electrons emerges from the metal. The filter is then replaced with one transmitting at 300 nm and the lamp adjusted so that the intensity of striking the surface is the same as it was for the 400 nm light. With the 300 nm light :-.

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