Electromagnetic radiation can be defined as a form of energy that is produced by the movement of electrically charged particles traveling through a matter or vacuum or by oscillating magnetic and electric disturbance. Longer wavelengths with lower frequency are less powerful in terms of energy, while shorter wavelengths at higher frequencies are more powerful. Our editors will review what you’ve submitted and determine whether to revise the article. Ultraviolet rays are germicidal in nature and destroy bacteria, viruses and moulds from various surfaces, air or water. Such is also true of X-rays, which are important in medicine as they allow physicians to observe the inner parts of the body but exposure to which should be kept to a minimum. The lesson focuses on radio waves to remind students of the concepts of frequency and wavelength, and ends with the speed of electromagnetic radiation, which is the same as the speed of light. Get exclusive access to content from our 1768 First Edition with your subscription. Electromagnetic Radiation • Radiant energy that exhibits wavelength-like behavior and travels through space at the speed of light in a vacuum. Radiation is energy in the form of waves of particles. Electromagnetic Radiation 1. scienceisbeauty.tumblr.com Electromagnetic Radiation Sarah Jones 2. • Light travels as an electromagnetic wave. 1 0 obj <> The spectrum of frequencies of electromagnetic radiation extends from very low values over the range of radio waves, television waves, and microwaves to visible light and beyond to the substantially higher values of ultraviolet light, X-rays, and gamma rays. Everyday life is pervaded by artificially made electromagnetic radiation: food is heated in microwave ovens, airplanes are guided by radar waves, television sets receive electromagnetic waves transmitted by broadcasting stations, and infrared waves from heaters provide warmth. It consists of both electric and magnetic field components. Electromagnetic (EM) radiation is a form of energy that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma rays. %���� Electric and Magnetic Fields A changing electric field generates a changing magnetic field. Electromagnetic radiation is all around us. • Light travels through the vacuum of space – unlike sound. endobj Electromagnetic radiation can be useful as well as hazardous. Corrections? There is a spectrum of electromagnetic radiation with variable wavelengths and frequency, which in turn imparts different characteristics. As soon as the Sun sets, incandescent or fluorescent lights are turned on to provide artificial illumination, and cities glow brightly with the colourful fluorescent and neon lamps of advertisement signs. Each field has energy that comes from a … Familiar too is ultraviolet radiation, which the eyes cannot see but whose effect is felt as pain from sunburn. 19 3.7 The ICNIRP guidelines apply only to short-term exposure. Electromagnetic radiation is a phenomenon that takes the form of self-propagating energy waves as it travels through space (vacuum or matter). The energy waves oscillate in phase perpendicular to each other and perpendicular to … At sufficiently high flux levels, various bands of electromagnetic radiation have been found to cause deleterious health effects in people.. Electromagnetic radiation can be classified into two types: ionizing radiation and non-ionizing radiation, based on the capability of a single photon with more than 10 eV energy to ionize atoms or break chemical bonds. Diagram of photosynthesis showing how water, light, and carbon dioxide are absorbed by a plant to produce oxygen, sugars, and more carbon dioxide. Electromagnetic fields (EMF) are invisible areas of energy, 7 measured in hertz (Hz). Abstract—Radiofrequency electromagnetic fields (EMFs) are used to enable a number of modern devices, including mobile telecom-munications infrastructure and phones, Wi-Fi, and Bluetooth. In this timely book, the authors comprehensively treat two integrated aspects of electromagnetic radiation, theory and application. Figure 7.5: The electromagnetic spectrum. The application of electromagnetic radiation in modern life is one of the most developing technologies. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. 2. Electromagnetic radiation is commonly referred to as "light", EM, EMR, or electromagnetic waves. Sunlight is also a form of EM energy, but visible light is only a small portion of the EM spectrum, which contains a broad range of electromagnetic wavelengths. The symbol h is Planck’s constant, while the value of ν is the same as that of the frequency of the electromagnetic wave of classical theory. This spectrum includes visible light, X-rays and radio waves. Light • Light is a form of energy known as electromagnetic radiation. In such a wave, time-varying electric and magnetic fields are mutually linked with each other at right angles and perpendicular to the direction of motion. Swapan Kumar Haldar, in Mineral Exploration (Second Edition), 2018. Less familiar are gamma rays, which come from nuclear reactions and radioactive decay and are part of the harmful high-energy radiation of radioactive materials and nuclear weapons. The basic properties and behaviour of electromagnetic radiation are discussed in this article, as are its various forms, including their sources, distinguishing characteristics, and practical applications. In a vacuum ultraviolet rays are germicidal in nature and destroy bacteria, viruses and moulds from surfaces! 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