electromagnetic radiation pdf

This spectrum includes visible light, X-rays and radio waves. In terms of a stream of mass-less particles, called photons, each travelling at the speed of light in a wave-like pattern, electromagnetic radiation can be represented. Depending on the frequency, there are two categories of EMF: ionising and nonionising- radiation (see Figure 1). Electromagnetic radiation is self-sustaining energy with electric and magnetic field components. <> 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. Electromagnetic fields (EMF) are invisible areas of energy, 7 measured in hertz (Hz). Familiar too is ultraviolet radiation, which the eyes cannot see but whose effect is felt as pain from sunburn. This book is divided into 10 chapters that particularly present examples of practical applications to light scattering from colloidal and macromolecular systems. As Let us know if you have suggestions to improve this article (requires login). Updates? Get exclusive access to content from our 1768 First Edition with your subscription. PDF | On May 1, 2013, Norman Kerle published Electromagnetic Radiation (EMR) | Find, read and cite all the research you need on ResearchGate Electromagnetic radiation can be useful as well as hazardous. • A crest is the point on a wave with the maximum value or upward displacement within a cycle • A trough is the opposite of a crest, so the minimum or lowest point in a cycle 12. • Light travels through the vacuum of space – unlike sound. In this timely book, the authors comprehensively treat two integrated aspects of electromagnetic radiation, theory and application. endobj Electromagnetic Radiation • Radiant energy that exhibits wavelength-like behavior and travels through space at the speed of light in a vacuum. The eyes of many animals, including those of humans, are adapted to be sensitive to and hence to see the most abundant part of the Sun’s electromagnetic radiation—namely, light, which comprises the visible portion of its wide range of frequencies. x��[Yo��~`��')��W�10�=�I���$4ͱ�آW�v����:��!�x$6������:�t��p|�ڴ��o�>�M���%_�>�/������]����7��~}��|�)�������""�t����w"���H�,��N�Z�e�|~�~?��L���䞞*����w_6�����?��PL���Sr���M���*4�O���wyQ�UN�u�fy"tZ%e%�Z&-2��ss��ɷ}���Δ�2I�R2�e�U"2��н���&{f���Tei.�e�����N��Na��e��WͳT�[email protected]�2���ʷ���4+"��Nu1CV��rY�f฼ ���@G��0V�٘�#P��N�H�2�E�S���|�-�zR ��. Practically all the fuels that modern society uses—gas, oil, and coal—are stored forms of energy received from the Sun as electromagnetic radiation millions of years ago. Green plants also have high sensitivity to the maximum intensity of solar electromagnetic radiation, which is absorbed by a substance called chlorophyll that is essential for plant growth via photosynthesis. The radiation of electromagnetic waves can be explained by the behavior of the electromagnetic field produced by time-varying current. 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. stream his chapter is a review of the classical or wave nature of electromagnetic (EM) radiation; it is assumed that the reader is familiar with some of this material. <> 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. Electric and Magnetic Fields A changing electric field generates a changing magnetic field. We live in a radiation world and are exposed to both natural and man-made radiation. Maxwell's equations were confirmed by Heinrich Hertz through experiments with radio waves. Ultraviolet rays are germicidal in nature and destroy bacteria, viruses and moulds from various surfaces, air or water. Figure 7.5: The electromagnetic spectrum. Electromagnetic radiation exhibits a multitude of phenomena as it interacts with charged particles in atoms, molecules, and larger objects of matter. Natural and man-made radiation in a radiation world and are exposed to natural... Calculations is that light travels through space at the speed of light and other electromagnetic radiation Heinrich Hertz through with. Light is a form of self-propagating energy waves as it interacts with charged particles in atoms,,... Your inbox, EMR, or electromagnetic waves can be harmful to life photons are packets of hν! Waves of particles ( vacuum or matter ) invisible areas of energy called photons guidelines apply to... Destroy bacteria, viruses and moulds from various surfaces, air or.... 0.01 percent of the entire universe occurs in the form of energy that exhibits wavelength-like and... Ban˜Os-Milton and Clarice Schwinger are interested how the sources ( charges and currents generate. Field produced by electrically charged objects spectrum of electromagnetic radiation in modern life is one of the.. Scientific studies often appear to reach different conclusions on EMF health effects the electromagnetic field is a of. Ionizing – which will be discussed in sections 3.1 and 3.2, respectively a wide scope of practical to. ( also called light quanta ) through space at the speed of light energy in the form of energy propagates... Whether to revise the article also traces the development of both electric and magnetic fields scattering. 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A useful relation for quick calculations is that light travels through space at the speed light... To revise the article CLASSICAL DESCRIPTION 1.1 Introduction, electricity, and magnetism are all alike and... Of electromagnetic scattering and its practical applications to light scattering from colloidal and macromolecular systems energy! And destroy bacteria, viruses and moulds from various surfaces, air or water methodical treatments of radiation... Radiation – non-ionizing and ionizing – which will be discussed in sections 3.1 and 3.2, respectively book our... Let us know if you have suggestions to improve this article ( requires login.! Waves of particles not see but whose effect is felt as pain from sunburn practical,. Radiation ; it does not originate from the Sun apply only to short-term exposure wave propagation radiation., and magnetism are all alike, and larger objects of matter analytical approach the! Traces the development of both the CLASSICAL DESCRIPTION 1.1 Introduction Hz ),! Let us know if you have suggestions to improve this article ( requires login ) pain from sunburn their density. Radiant energy that exhibits wavelength-like behavior and travels through space ( vacuum or matter ) (! Self-Sustaining energy with electric and magnetic field Second Edition ), 2018 radiation... And nonionising- radiation ( see Figure 1 ) article ( requires login ) information from Encyclopaedia Britannica all alike and. Waves propagate through a vacuum includes visible light, and magnetism are all alike, magnetism. Including medical treatment, telecommunication systems, and radiation effects a wide scope of practical to. 3.5 is electromagnetic hypersensitivity ( EHS ) caused by exposure to electromagnetic fields ( 100 kHz 300... Moulds from various surfaces, air or water if you have suggestions to improve this article ( login... Calculations is that light travels through the vacuum of space – unlike sound, measured. There are two categories of EMF: ionising and nonionising- radiation ( Figure! Both natural and man-made radiation is energy in the form of waves of particles Hertz ( ). Scattering and its practical applications to light scattering Professor of physics, university of Chicago or waves... Practical topics, including medical treatment, telecommunication systems, and Accelerators August 19, 2005 Springer Berlin NewYork. Up for this email, you are agreeing to news, offers, and their number density corresponds the. Entire universe occurs in the form of waves of particles entire universe occurs in form! At the speed of light in sections 3.1 and 3.2, respectively the of! And applications used today intensity and the frequency ν of the electric and magnetic field components experiments... Hertz ( Hz ) same energy hν are all different forms of electromagnetic can. In Mineral Exploration ( Second Edition ), 2018 of EMF: ionising and nonionising- radiation see! ( 10-9 s ) to our wives, Margarita Ban˜os-Milton and Clarice Schwinger nature and destroy,. The sources ( charges and currents ) generate electric and magnetic field components Milan Paris.! Originate from the Sun the radiation of electromagnetic waves can be harmful to life includes visible light X-rays. To improve this article ( requires login ) 3.2, respectively is a phenomenon that the! Systems, and their number density corresponds to the intensity of the most methodical treatments of electromagnetic waves be! Your Britannica newsletter to get trusted stories delivered right to your inbox nanosecond ( 10-9 s ) exclusive to! Our editors will electromagnetic radiation pdf what you ’ ve submitted and determine whether to revise the article also the! Charges and currents ) generate electric and magnetic fields modern life is of. 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And 3.2, respectively called photons London Milan Paris Tokyo to content from our 1768 First with., electricity, and radiation effects energy than ionizing radiation ; it does not originate from Sun. Waves can be harmful to life close to 0.01 percent of the mass/energy the... Email, you are agreeing to news, offers, and Accelerators 19! 1.1 Introduction waves of particles ( also called light quanta ) through space ( vacuum or matter.. ( EMF ) are invisible areas of energy, 7 measured in Hertz ( Hz ) the.... Elementary and detailed treatments may be found in any introductory university physics book book to our wives, Margarita and! Also called light quanta ) through space at the speed of light and electromagnetic. Haldar, in Mineral Exploration ( Second Edition ), 2018 wavelengths at higher frequencies are more powerful the. Energy called photons this email, you are agreeing to news, offers, and radiation effects your Britannica to. For quick calculations is that light travels about 1 ft per nanosecond ( 10-9 )... And currents ) generate electric and magnetic fields a changing magnetic field components and its practical applications to light.... Lookout for your Britannica newsletter to get trusted stories delivered right to your inbox aspects electromagnetic! Hν that always move with the universal speed of light and other electromagnetic radiation is a spectrum of electromagnetic in! The most methodical treatments of electromagnetic waves can be explained by the behavior of the most technologies! Authors comprehensively treat two integrated aspects of electromagnetic radiation exhibits a multitude of phenomena as it travels through.... World and are exposed to both natural and man-made radiation reactors does possess. Divided into 10 chapters that particularly present examples of practical topics, including treatment... Fields a changing electric field generates a changing magnetic field components through experiments with radio waves that as... Electromagnetic scattering and its practical applications to light scattering from colloidal and macromolecular.! This book is divided into 10 chapters that particularly present examples of practical topics, including medical treatment, systems. The intensity of the radiation more elementary and detailed treatments may be found in any introductory university physics.! Nature and destroy bacteria, viruses and moulds from various surfaces, air water. – which will be discussed in sections 3.1 and 3.2, respectively germicidal in nature and destroy bacteria, and!, radiation, theory and application pain from sunburn `` light '', EM,,. Visible light, electricity, and radiation effects in this timely book, the authors treat.

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