Photoelectric effect

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At first J.J Thompson and his  friend showed that if a beam of light fall on a metal surface with a certain level of wavelength, metal surface will emite or eject electron. This phenomenon is termed as photoelectric effect. In generally, photoelectric effect is resulting of electron ejection from a metal surface with the effect of light beam on metal surface Once the scientists realized that most of the physics laws are unexplained by the Newtonian classical mechanics. photoelectric effect is one of the phenomenon that can not properly explained by Newtonian classical mechanics  Among a set of phenomenon in physics these are inappropriate for Newtonian classical mechanics , photoelectric effect is one of them that leads scientists to establish a new theorem or way that can explain these unexplained phenomenon. For this reason the emergence of quantum mechanics  happened. In this scense photoelectric effect may also called as the basis of establishing of quantum mechanics  The first theorem of quantum mechanics  is planks quantum theory of radiation  that is established by an observation of black body radiation. In 1905, Albert Einstein used planks quantum theory of radiation  in order to explain Photoelectric effect. Photoelectric effect and planks quantum theory of radiation  have a significant relationship. The metal surface if hit by a beam of light radiation then the metal surface eject electron. The impact of light energy on metal surface resulting into ejection of electron is termed as photoelectric effect. The electron ejected from the metal surface must contain energy. The amount of energy is equal to the hf, where the h is plank constant and f is the specific frequency of light Threshold frequency for photoelectric effect  In the study of photoelectric effect, threshold frequency is a very important topics. When photoelectric effect will happen, there have a specific condition. Each beam of light will not emite electron from metal surface. That means each beam of light do not show photoelectric effect. To show photoelectric effect the beam of light should have certain level of frequency. This certain level of frequency is called threshold frequency. Laws of Photoelectric effect  Photoelectric effect on metal surface follows some important laws. 1. For occuring  a photoelectric effect on metal surface the light beam fall on metal surface should have certain level of frequency which is called threshold frequency 2. For a photoelectric effect on a metal surface, how number of electron will eject that depends on intencity of light beam. 3.  Kinetic energy of photo electron ejected from metal surface due to photoelectric effect is not dependent with the intensity of the light but dependent of the frequency of the light.

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