Conditions of sensibility of photo-electric cells with alkali metals and hydrogen . Head of Department. Final Examination Committee on UlUC 1. Conditions of renflihility of Photo-Electrie Cells withAlkali and Hydrogen. Introduction. Under certain con-Utions all metals emit electricity v;hen actedupon by light waves. This is called the Photo-ElectricEffect, , the Light-Electric Effect. The intensity of this ef-fect is largest for those metals vhich are most electro-positive;, those metals which give off electrons m^st readily. The orderof photo-electric strengths for
Conditions of sensibility of photo-electric cells with alkali metals and hydrogen . Head of Department. Final Examination Committee on UlUC 1. Conditions of renflihility of Photo-Electrie Cells withAlkali and Hydrogen. Introduction. Under certain con-Utions all metals emit electricity v;hen actedupon by light waves. This is called the Photo-ElectricEffect, , the Light-Electric Effect. The intensity of this ef-fect is largest for those metals vhich are most electro-positive;, those metals which give off electrons m^st readily. The orderof photo-electric strengths for the metals as given by ^is as follows:- caesium, rubidium, potassium, potassium-sodium alloy,sodium, lithium, magnesium, thallium and zinc. For copi^er, platinum,lead, iron, cadmium, carbon and mercury tlie photo-electric effect isvery weak. The order of the metals for this e^fect is precisely thesame as that in the ^^olta series for contact-electricity. Ey means of I>Jaxwells electromagnetic theory of light, the elec-tric action of a beam of light incident upon a metal surface may b
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