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This process is called the photoelectric effect (or photoelectric emission or photoemission), a material that can exhibit this phenomenon is said to be photoemissive, and the ejected electrons are called photoelectrons; but there is nothing that would distinguish them from other electrons. Photoelectric effect refers to the phenomenon in which electrons are emitted from a material when it is exposed to light (electromagnetic radiation) of sufficient energy. Photoelectric effect provided evidence for the quantized nature of light and supported the wave-particle duality of electromagnetic radiation. The dual nature of matter and the dual nature of radiation are important concepts states that a matter can exhibit both particle like and wave like properties. In this article, we ... The photoelectric effect is the emission of electrons from a material caused by electromagnetic radiation such as ultraviolet light. Electrons emitted in this manner are called photoelectrons. Photoelectric Effect The photoelectric effect is a phenomenon where metals emit electrically charged particles upon absorbing electromagnetic radiation. Specifically, it involves the ejection of electrons from a metal surface. This effect is the foundation of modern physics as it addresses a fundamental question about the nature of light. Albert Einstein famously explained this phenomenon in 1905. However, Heinrich Rudolf Hertz laid the groundwork for the photoelectric effect theory in 1887 ...