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Utilising the properties of certain alkali metals and the particle-like properties of light, the photoelectric effect can be used to estimate the value of It was observed as early as 1905 that most metals under influence of radiation, emit electrons. This phenomenon was termed as photoelectric emission. applied Planck's theory and explained the photoelectric effect in terms of the quantum model using his famous equation, for which he received the NobelThe objectives of the photoelectric effect are measuring Planck's constant, measuring current-voltage characteristics of spectral lines for both (constant In this experiment we will determine the Planck's constant through photoelectric effect. Explain- ing the somewhat puzzling result — the stopping potential THE PHOTOELECTRIC EFFECT AND PLANCK'S CONSTANT​​ A voltage called the stopping voltage or stopping potential is applied to halt the flow of photoelectrons. If This experiment uses a mercury lamp to generate the photons incident on the light sensitive material.