Write three applications of photoelectric effect
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Photoelectric cells were originally used to detect light, using a vacuum tube containing a cathode, to emit electrons, and an anode, to gather the resulting current. Today, these "phototubes" have advanced to semiconductor-based photodiodes that are used in applications such as solar cells and fiber optics telecommunications.
Photomultiplier tubes are a variation of the phototube, but they have several metal plates called dynodes. Electrons are released after light strikes the cathodes. The electrons then fall onto the first dynode, which releases more electrons that fall on the second dynode, then on to the third, fourth, and so forth. Each dynode amplifies the current; after about 10 dynodes, the current is strong enough for the photomultipliers to detect even single photons. Examples of this are used in spectroscopy (which breaks apart light into different wavelengths to learn more about the chemical compositions of star, for example), and computerized axial tomography (CAT) scans that examine the body.
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Answer:
Explanation:
When light hits a metal surface it can produce an electric potential. This phenomenon is called a photoelectric effect. This concept is used to generate electricity directly from the energy of light. Solar Panels use this concept in full effect to charge the batteries of the calculators, as a source of power supply in traffic lights and also used as the source of light to light up our homes. Solar energy is one of the reliable sources of energy and it is the largest source of energy on planet earth. The use of solar energy helps in cutting down power costs and to have a healthier environment.
Light of a sufficiently small wavelength can have enough energy to knock out some electrons from a metal surface. This is known as the photoelectric effect. In many ways, this is the opposite of atomic spectral emission where electrons from higher energy states lose energy and emit light. In the photoelectric effect, if a photon of light has sufficient energy, it can raise the electron to a higher energy level and even let it escape the atom’s grasp; in other words, emit an electron. When this happens, a potential difference develops between the atom and the electron, enabling us to use this effect to generate electricity.