Technical data Planck's "quantum of action" and external photoelectric effectArticle no: P2510511 ![]()
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Principle The photoelectric effect is one key experiment in the development of modern physics. White light from a filament lamp is filtered by a grating spectrometer and illuminates a photocell. The maximum energy of the ejected electrons depends only on the frequency of the incident light, and is independent of its intensity. This law appears to be in contradiction with the electromagnetic wave theory of the light, but it becomes understandable in the frame of the corpuscular theory of light. The stopping voltage U at different light frequencies is determined by the I /U characteristics of the photocell and plotted over the corresponding light frequency f . Plancks quantum of action is then determined from this graph. Benefits
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