from the deadly effects of ionizing radiation that includes electromagnetic radiation and particle radiation. Sometimes radiation cannot be controlled or contained and accidents take place causing radiation leaks. For this reason‚ protocols and radiation safety has become a pre-curser in our everyday life. Ionization which includes solar wind‚ cosmic radiation and neutron flux found in nuclear reactors. Then there is electromagnetic radiation‚ under which comes X-rays‚ gamma radiation and ultra
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waves: a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth’s surface Line of propagation: is the electro-magnetic radiation or acoustic wave propagation. Electromagnetic transmission light travels in a straight line. The rays or waves can be diffracted‚ refracted‚ reflected‚ or absorbed by atmosphere and obstructions with material and generally cannot travel over the horizon or behind obstacles. Ground waves:
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may occur in one‚ two or three dimensions‚ depending on the nature of the wave and the medium Identify that mechanical waves require a medium for propagation while electromagnetic waves do not Mechanical: Requires a medium for propagation (ie. Travel through) Eg. Sound Waves‚ Water Waves‚ Waves in a string .. Electromagnetic: Do not require a medium for propagation (ie. EM Waves can pass through a vacuum) Eg. Light‚ Infrared‚ UV‚ X rays‚ Gamma Rays‚ Radio waves‚ Microwaves .. Define
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important one: microwaves and their effect on plants. Microwaves are going to be the focus of our study because of the drastic effects that they have‚ not only on humans and different mammals but on plants. In brief‚ we can say that microwaves are electromagnetic waves with wave length longer than those of terahertz (THz) frequencies‚ but relatively short for radio waves. There are lots of sites contaminated by microwave radiation from cellular radiation‚ power plants and high voltage towers‚ etc….. These
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the applicator. The sectional structure of the applicator consists of two kinds of parts. One is the dielectric to supply microwave. The other is the transducer to supply ultrasound which is a part of inner conductor. With this applicator‚ electromagnetic (EM) wave at 430 MHz and ultrasound at l MHz are applied simultaneously. Ultrasound is greatly reflected at the boundary surface between different media‚ because its acoustic impedance is different. So when ultrasound is applied to human tissues
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Examples of Radiant Energy The term radiant energy refers to energy that travels by waves or particles‚ particularly electromagnetic radiation such as heat or x-rays. Radiant energy is created through electromagnetic waves and was discovered in 1885 by Sir William Crookes. Fields in which this terminology is most often used are telecommunications‚ heating‚ radiometry‚ lighting‚ and in terms of energy created from the sun. Radiant energy is measured in joules. Ads by Google Best Solar Investments
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effects locally and detect them at a distance. Keywords: I. INTRODUCTION It is known that electromagnetic energy is associated with the propagation of electromagnetic waves. Theoretically‚ we can use all electromagnetic waves for a wireless power transmission (WPT). The difference between the WPT and communication systems is only efficiency. Maxwell’s Equations indicate that the electromagnetic field and its power diffuse to all directions. Though we transmit energy in a communication system
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Everywhere I turn‚ I see someone on a cell phone‚ either talking or texting. Every car next to me in traffic has a GPS on the dashboard‚ including my own. It seems that everyone needs some help from technology on a daily basis. It both surrounds and intrigues us. Technology can be helpful‚ fun‚ and entertaining. Much of technology is created to assist with making projects faster or daily tasks more efficient. However‚ the collaboration of technologies in our lives has a few negative effects and I
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PHOTOGRAPHY The word photography derives from the Greek phōtos means "light" and graphos means "drawing"‚ together meaning "drawing with light". Photography is the art‚ science‚ and practice of creating durable images by recording light or other electromagnetic radiation‚ either chemically by means of a light-sensitive material or electronically by means of an image sensor. Photography has many uses for business‚ science‚ manufacturing‚ art‚ recreational purposes‚ and mass communication. Modern photography
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metal tube or pipe‚ through which electromagnetic waves are propagated in microwave and RF communications. It is commonly used in microwave communications‚ broadcasting‚ and radar installations. A waveguide must have a certain minimum diameter relative to the wavelength of the signal and therefore are practical only for signals of extremely high frequency. Consequently below such frequencies‚ waveguides are useless as electrical transmission lines. “An electromagnetic field can propagate along a waveguide
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