The photoelectric effect

The photoelectric effect is a phenomenon of the rise of the cathode when the cathode ray irradiated by very high frequency Electromagnetic Waves (sometimes evidenced by the emergence of currents) in a device of the photoelectric effect. in one literarur, Philip Lenard was the inventor of the first symptoms of the photoelectric effect. This phenomenon of the era came to a halt in the field of theoretical physics because of the rarity of occurrence of an electric current. events photoelectric effect occurs when a metal when given light will release electrons, which would generate an electric current when connected to a closed circuit. If light is a wave as predicted by classical physics, it should have the higher the intensity of light is given, the greater the flow is detected. However, experimental results show that although the intensity of the light is maximum, the electrons do not appear as well from the metal plate. But when given a light with shorter wavelengths (higher frequencies, toward the purple color of the light spectrum) than before, suddenly loose electrons from the metal plate so that the detected electric current, whereas the intensity of a given smaller than previous intensity. Means, the energy required by a metal plate to release electrons depends on the wavelength. This phenomenon can not be explained by physicists at that time. If the light was indeed a wave, which has a continuous nature, should not the energy that can be absorbed from it could be worth whatever? But it was only a certain amount of energy that can be absorbed to release free electrons. This puzzle was finally answered by Albert Einstein, who argued that light is quantized in lumps, clumps of particles of light called photons (by basing the theory of Planck). Energy carried by photons is proportional to the frequency of light and constant called Planck's constant. It takes a photon with energy higher than the electron binding energy to remove electrons out of the metal plate. When the frequency of the light is still low, so even though the intensity of

the light is maximum, photons do not have enough energy to remove electrons from the bond. But when the frequency of the light is higher, then even if there is only one photon alone (low intensity) with sufficient energy, the photon is able to remove one electron from its binding. The light intensity is increased means that more number of photons are released, consequently the more electrons will escape. Einstein answer the riddle of photoelectric. On the duality of light and Einstein In late summer of 1909 Einstein was invited to the annual conference Naturforscher. There he was asked to talk about relativity and quantum theory of light. Many attendees who wish to present Einstein's Relativity, Einstein argued yet another, bahwasannya interpretation of the quantum theory of light and a reconciliation to Maxwell's wave theory eleoktromagnet elegant. Einstein explained that the wave theory of light is still incomplete. Light - or GEM else - it is still easier to understand as emission or emission of particles as submitted Newton. However, by combining the two properties of light as a wave and a particle will bring fundamental change in physics. and he was afraid it was not a good thing. However, following the Planck thinking about just the nature of quantum radiation is absorbed and emitted by the surface, not the true nature of light when propagating in space. After a while, he found it impossible theory. As a result, Einstein said, the light should be considered a light wave and particle flow. and they can not be considered to be contradictory. Here, Einstein said humbly that not all the things that the old should be replaced with new ones and with humility, acceptance (with admiration) of the Maxwell wave theory, make the duality theory of light can last up to now