Photo Electricity the Liberation of Electrons By Light With Chapters On Fluore
Photo Electricity the Liberation of Electrons By Light With Chapters On Fluore
Herbert Stanley Allen
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Camb. Phil. Soc. , 14, pp. 417-424, 1906-8. THEORIES OF PHOTO-ELECTRIC ACTION 147 plausible the proportionality between the number of electrons emitted and the intensity of the light, and the independence of the velocity of emission on that intensity. " Thus, if we consider light falling on a metal plate, if we increase the distance of the source of light we shall diminish the number of these different bundles or units falling on a given area of the metal, but we shall not diminish the energy i...n the indi- vidual units. Thus any effect which can be produced by a unit by itself will, when the source of light is removed to a greater distance, take place less frequently, it is true, but when it does take place it will be of the same character as when the intensity of the light was stronger. " The quantum or unitary theory of light (Licht quant en- hypothese) is derived from the work of Planck * on the radia- tion laws of a black body. The energy of radiation is sup- posed to be built up of an integral number of finite elements.
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