Photoelectric effect

Grecia S. Laboy

The photoelectric effect is the emission of electrons from a metal when you affect it electromagnetic radiation (visible light or ultraviolet light, in general). Sometimes the term is included in other types of interaction between light and matter. The photoelectric effect was discovered and described by Heinrich Hertz in 1887, noting that the arc jumps between two electrodes connected to high voltage reaches greater distances when illuminated with ultraviolet light when left in the dark. The theoretical explanation was made by Albert Einstein, who in 1905 published the groundbreaking article "Heuristics for the generation and conversion of light", basing his formulation of the photoelectric work on an extension of the Max Planck quanta. Robert Andrews Millikan later spent ten years experimenting to prove Einstein's theory was wrong, to finally conclude that if the Photoelectric Effect era. The derive the equation that describes this effect in order to calculate Planck's constant and determine the work done to remove these electrons from the material. It was therefore necessary to turn on the mercury lamp and choose the lines of greater intensity. Thus, we analyze how much voltage was needed to remove electrons in different rays of light. Thus, we find the relation proposed by Einstein to explain the photoelectric effect (electron kinetic energy gives a straight line by changing the frequency of light). The slope of this is needed to calculate Planck's constant by several equations, because this is equal to the ratio of the electron charge, h (m = h / e). The product of the potential work load is (by definition of potential V = W / e). Assuming the value of the intercept will tell us the amount of work necessary to remove these electrons from the material provided. This tells us that the intercept of the equation it means is the potential to cut or braking. This cutting potential is independent of radiation intensity (I), but depends on its frequency. To derive the equation describing the photoelectric effect which is E_K=ν*h-W where the frequency of light radiation, h is Planck's constant and W is the work required to move an electron energy level. E_K is the kinetic energy of a photon emitted. We modify this equation dividing by the base load "and" and obtained a new equation: V=h/e ν-W/e

For each color there is a radiation frequency of light and a single voltage. During this experiment we measure the voltage with the team badge of each color and then create a graph of voltage vs. frequency. We relate the value of the slope of the graph with the slope of the equation "m = h / e" and cleared in order to find "h" Planck's constant experimental. Plank's constant is used to relate dimensions of mass or energy with dimensions of length or time. Because the focus of the experiment units are Planck's constant joules * seconds (Js). Using this graph and the equation above also relate the intercept value of the intercept found in the equation "b = W / e", the clear stand "W", work in units of joules (J).