Physics of Microwaves Essay - 981 Words

Physics of Microwaves Microwaves are used in our everyday lives but most most people dont realize that physics plays a large and important part in the simple household item. Whenever we heat our food we are oblivious to the forces that cause such a thing to occur and we dont fully understand what happens in front of our eyes and how our food really gets heated in such a simple and efficient way. The first thing people need to understand is that microwaves are actually electromagnetic waves. Wavelengths and frequencies range from 300 MHz up to 300 GHz but, the average microwaves at home or restaurants operate at frequencies of about 2.45 GHz. Microwaves consist of a waveguide, magnetron, fan, power supply and a turntable with the†¦show more content†¦Microwaves have to have a source and that source is the device known as the magnetron. The magnetron is basically an electric field existing in the gap os the device. Magnetrons also consist of a cylindrical cathode running throu gh the centre and the outside of the tube, formed by several cavities acting as anode and takes shape. With all this it allows the electric field to exist at the center. Perpendicular to the electric field is where the parallel to the tube length is where the permanent electric field. Located in the cathode, electrons are stripped into the electric field due to the thermionic emission which is high temperatures in the cathode exciting the electrons to make it be released. Once this is done they are accelerated to the anode, the outside of the tube, because of the forces applied to them from the electric field. Another force is also applied to them as they are on their way which is the magnetic field and this curves their motion. With their curved motion the places where there are excess negative charges in the anode is where the electrons are pushed towards. Negatives charges are then pushed back and around the cavity creating an oscillation of electric and magnetic fields caused by the moving electrons and charges. The waves emitted from the magnetron are faced towards the spinning propellor that is made of metal. Metal isShow MoreRelatedPhysics Of A Microwave Oven1480 Words   |  6 Pages Physics of a Microwave Southeast Missouri State University PH106-01 Instructor: Dr. Jian Peng Submitted By: Natalie Gladbach â€Æ' The microwave, also known as a microwave oven, was seemingly a breakthrough in technology in the early 1940’s that allowed whole meals to be prepared in minutes. The idea of the microwave was created by a man named Percy Spencer. Mr. Spencer developed the plans based on radar technology breakthroughs from World War II. 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